Problem:


Score : 600 points

Problem Statement

Let us define the oddness of a permutation p = {p_1,\ p_2,\ ...,\ p_n} of {1,\ 2,\ ...,\ n} as \sum_{i = 1}^n |i - p_i|.

Find the number of permutations of {1,\ 2,\ ...,\ n} of oddness k, modulo 10^9+7.

Constraints

All values in input are integers.

1 \leq n \leq 50

0 \leq k \leq n^2

Input

Input is given from Standard Input in the following format:

n k

Output

Print the number of permutations of {1,\ 2,\ ...,\ n} of oddness k, modulo 10^9+7.

Sample Input 1

3 2

Sample Output 1

2

There are six permutations of {1,\ 2,\ 3}. Among them, two have oddness of 2:  {2,\ 1,\ 3} and {1,\ 3,\ 2}.

Sample Input 2

39 14

Sample Output 2

74764168



Sample input:
3 2


Sample output:
2

Submission status: Wrong Answer

Solution code:
from collections import defaultdict,deque
import sys,heapq,bisect,math,itertools,string,queue,copy,time
sys.setrecursionlimit(10**8)
INF = float('inf')
mod = 10**9+7
eps = 10**-7
def inp(): return int(input())
def inpl(): return list(map(int, input().split()))
def inpl_str(): return list(input().split())
N,K = inpl()
ans = [[] for _ in range(51)]
ans[0]= [1]
ans[1]= [1]
ans[2]= [1]
ans[3]= [1, 2, 3]
ans[4]= [1, 3, 7, 9, 4]
ans[5]= [1, 4, 12, 24, 35, 24, 20]
ans[6]= [1, 5, 18, 46, 93, 137, 148, 136, 100, 36]
ans[7]= [1, 6, 25, 76, 187, 366, 591, 744, 884, 832, 716, 360, 252]
ans[8]= [1, 7, 33, 115, 327, 765, 1523, 2553, 3696, 4852, 5708, 5892, 5452, 4212, 2844, 1764, 576]
ans[9]= [1, 8, 42, 164, 524, 1400, 3226, 6436, 11323, 17640, 25472, 33280, 40520, 44240, 45512, 40608, 35496, 25632, 18108, 8064, 5184]
ans[10]= [1, 9, 52, 224, 790, 2350, 6072, 13768, 27821, 50461, 83420, 127840, 182256, 242272, 301648, 350864, 382576, 389232, 373536, 332640, 273060, 208548, 136512, 81792, 46656, 14400]
ans[11]= [1, 10, 63, 296, 1138, 3708, 10538, 26480, 59673, 121626, 226787, 390144, 628744, 949472, 1355952, 1826464, 2341600, 2833632, 3282464, 3584160, 3765600, 3719664, 3531924, 3093336, 2642364, 2010240, 1508544, 963072, 621504, 259200, 158400]
ans[12]= [1, 11, 75, 381, 1582, 5582, 17222, 47194, 116457, 261163, 537459, 1022981, 1817652, 3040352, 4810720, 7230928, 10360160, 14178912, 18577792, 23327872, 28132048, 32571504, 36310464, 38903904, 40028724, 39552156, 37457388, 33941412, 29314944, 24179904, 18835776, 13777344, 9452736, 5716800, 3211200, 1742400, 518400]
ans[13]= [1, 12, 88, 480, 2137, 8096, 26860, 79376, 211811, 515308, 1153268, 2391936, 4633331, 8438664, 14557048, 23874176, 37407760, 56117824, 80906752, 112162240, 150052400, 193572736, 241706624, 291576384, 341323776, 386160048, 424359540, 450394992, 464545584, 461528208, 446428476, 413557632, 373573440, 321120000, 268449408, 210332160, 162330624, 112550400, 77788800, 46540800, 28497600, 11404800, 6739200]
ans[14]= [1, 13, 102, 594, 2819, 11391, 40344, 127508, 364587, 952559, 2293742, 5126898, 10710633, 21042989, 39117852, 69175664, 116857024, 189256368, 294745440, 442503456, 641759376, 900689616, 225195321, 617201401, 74227554, 586823330, 140227131, 711888699, 274217080, 795069832, 242715461, 585116357, 796764497, 861974465, 769155485, 525176285, 146566301, 650715556, 73773796, 455145195, 828946802, 226153586, 685663993, 216281593, 828705600, 536385600, 309484800, 166924800, 87609600, 25401600]
ans[15]= [1, 14, 117, 724, 3645, 15626, 58741, 197280, 600215, 1671266, 4295107, 10259436, 22922995, 48184950, 95816051, 181136304, 327071752, 566117888, 942525072, 513281017, 349163810, 532145419, 154557773, 309226767, 88509354, 563257605, 789064441, 766807654, 474675580, 795689314, 599134613, 627066840, 658988947, 307608398, 337632800, 295701193, 44870369, 150212311, 705302359, 336038622, 452522163, 797367958, 62674553, 57993322, 777736994, 845298906, 452367755, 90655804, 810196653, 976943895, 564798323, 582118351, 994783972, 869862386, 697759993, 660441600, 381024000]
ans[16]= [1, 15, 133, 871, 4633, 20979, 83313, 295803, 952299, 2809009, 7656027, 19414457, 46086247, 102967901, 217634463, 437195525, 838372452, 540635289, 722168530, 638311860, 640827391, 196046908, 898688562, 478199884, 793020369, 808862771, 562236075, 94791602, 385333320, 237794527, 197694759, 398043392, 504456766, 579736664, 78137089, 793367253, 961295251, 280517488, 179779783, 947563092, 901772777, 859566930, 199212409, 920781370, 362900807, 735004334, 297264154, 482748036, 653703312, 140400674, 623159781, 320434095, 373194802, 13313867, 205909676, 360223815, 570584277, 68075848, 372652149, 961247580, 23084534, 261139053, 151302323, 715359965, 625702393]
ans[17]= [1, 16, 150, 1036, 5802, 27648, 115538, 431844, 1464468, 4554040, 13096378, 35069940, 87969166, 207781760, 464351910, 986188668, 998611836, 879505923, 237509223, 15110629, 621334822, 88677622, 257578542, 963016850, 235638961, 442107823, 429101453, 483004748, 329733855, 718448185, 266304376, 413950543, 256286771, 626720357, 318467482, 59069608, 81901162, 352730851, 104241055, 503595237, 956355036, 534522134, 457799859, 108929893, 887297322, 424614770, 265024591, 876853471, 515703045, 692038809, 210906163, 20070317, 468291405, 145357835, 797577421, 232358134, 747771239, 343859985, 833879609, 78548665, 289896769, 449285934, 313197004, 379603290, 397630660, 609910102, 442642726, 627950853, 722186028, 705163253, 998661511, 771071664, 636940611]
ans[18]= [1, 17, 168, 1220, 7172, 35852, 157132, 616084, 2192506, 7159090, 21631676, 60902460, 160707468, 399489140, 939796228, 101060910, 481320121, 151453550, 952463061, 931694473, 957528293, 554162053, 990142499, 644946993, 651797781, 791594351, 556120466, 271969917, 107619398, 710253075, 280526462, 615698879, 99748930, 775178221, 257586036, 645364809, 806795120, 340635512, 801741075, 790520661, 68328385, 331513794, 351728404, 931812262, 91105169, 176869824, 445724501, 370449983, 359815736, 918724628, 869062973, 659791249, 657727222, 395793733, 32692523, 78858425, 151369211, 628504487, 842750087, 152091477, 889718876, 908002421, 944598446, 656459208, 712920845, 47550280, 92244967, 110652620, 951703750, 217822851, 901098263, 655149074, 861896271, 859184013, 992613245, 768042116, 807916959, 335381553, 909568095, 153171069, 827990317, 681893483]
ans[19]= [1, 18, 187, 1424, 8764, 45832, 210072, 861400, 3206786, 10957868, 34666130, 102239488, 282743580, 736889224, 817936097, 262532028, 534038590, 412279142, 965109380, 86702267, 846482566, 945052509, 644517943, 548776024, 679330947, 152291502, 882910517, 188127435, 636778925, 902059202, 132531208, 193904122, 893705022, 246193070, 652079051, 958060250, 148697872, 504141990, 371410212, 807466717, 514477363, 565424570, 560794838, 11419155, 215137208, 665710713, 791504234, 359367396, 224050172, 509091270, 125989128, 782600310, 957126038, 667219607, 386301613, 605448653, 296557741, 618019404, 194294675, 222923480, 765962783, 743934970, 24324611, 512643153, 214242880, 286900578, 228877964, 91240846, 430467141, 533029377, 904804693, 373207899, 916503101, 83598539, 560288494, 363356684, 68282446, 152683809, 284461190, 124425011, 167972327, 428909487, 373215034, 420008537, 513304383, 874743039, 487193257, 97337408, 532639641, 184378261, 955976093]
ans[20]= [1, 19, 207, 1649, 10600, 57852, 276620, 1183172, 4595034, 16384606, 54107670, 166643130, 481442164, 311240781, 381378831, 288429444, 380463632, 370477330, 171662912, 688513797, 626045604, 789881798, 844990830, 70546834, 230422087, 267733218, 970080423, 75064762, 104073936, 888990608, 393490487, 819401315, 362017415, 197941501, 97730360, 491049732, 790022455, 142301163, 381999002, 81566974, 255547256, 500580164, 503785886, 874661360, 953064009, 357278689, 416715628, 656421867, 311332859, 849655408, 575613107, 850236831, 533549113, 255339339, 611845477, 501164398, 135987981, 672393680, 678611757, 552403430, 470027818, 333312311, 203812034, 929380798, 133842121, 497262544, 839881753, 29703780, 133717366, 249364505, 959337844, 632980495, 72879056, 356819838, 662140760, 182352973, 260787823, 329159184, 423643610, 488600943, 164109163, 8143787, 184454683, 684285006, 693158498, 382122550, 488552031, 777204359, 564238497, 598675373, 603916585, 720234840, 93182262, 238936257, 486420235, 352604922, 958291193, 880928218, 736558676, 163545641, 189347824]
ans[21]= [1, 20, 228, 1896, 12703, 72200, 359348, 1599616, 6465450, 23997032, 82508708, 264654080, 796563486, 260832418, 76986106, 528774007, 854313906, 307546108, 722735109, 61004626, 805619536, 18191861, 511411798, 993782454, 401030744, 633897378, 70862649, 96855526, 314416445, 92910833, 135520920, 492052755, 24334887, 643976444, 574388511, 317610455, 122930943, 637889505, 255461238, 950861369, 48876234, 149504663, 198682481, 942670278, 866921314, 563621302, 960474580, 980132644, 624295523, 399490883, 351714973, 945626033, 827908349, 157456205, 481861323, 472454109, 343580291, 683697065, 95059407, 841332348, 464714941, 596887160, 38681949, 757883329, 590303711, 64921694, 730086270, 15240461, 714742087, 32874447, 175996750, 277466516, 788882909, 11880203, 95097385, 778398376, 531252352, 479554466, 557013590, 609738833, 798714176, 859324339, 721484640, 268442938, 861267595, 806087188, 31691029, 950412807, 580575404, 849451646, 691790951, 264837637, 967322620, 365040170, 622467624, 456436788, 658680316, 60575186, 387550026, 215002020, 31349904, 449373833, 559514745, 640364153, 807042078, 450172023, 562637973, 109112418, 545193132, 195217263, 976304283]
ans[22]= [1, 21, 250, 2166, 15097, 89189, 461164, 2132144, 8950214, 34503182, 123236828, 410729140, 284813823, 790835929, 594736274, 153822108, 374418504, 157537842, 147846917, 133568389, 483576696, 508616649, 656867821, 84463125, 640047601, 955370715, 182167616, 49108700, 229345632, 795610484, 502493987, 857101031, 142485158, 996679960, 742503997, 723858587, 317526153, 365342533, 250775491, 442738912, 408346120, 881242865, 135363327, 231979623, 347291745, 824934645, 995772018, 164592917, 354883487, 450805745, 963969802, 171006181, 92161176, 169883419, 961669090, 26844445, 393784092, 571606470, 464707158, 34144520, 652396373, 745405475, 202923498, 135935314, 703695236, 776259115, 48310283, 874186699, 219390686, 510394758, 751965065, 418424556, 8781061, 736058807, 674014147, 674780706, 590530540, 4352977, 803825827, 167292329, 541083402, 260679638, 665083995, 939990721, 816665296, 886017767, 669822229, 694816125, 643235536, 937314556, 115942268, 261159535, 687177905, 12245758, 694615643, 977706180, 217949106, 118952653, 898868241, 856650616, 42954342, 330321980, 535121720, 982503521, 719423135, 714354007, 18745970, 333448882, 302037622, 935654015, 778423936, 317991952, 284756555, 504736970, 155871365, 118263505, 797065125, 640838446, 258037348, 34344762, 502389803, 911086550]
ans[23]= [1, 22, 273, 2460, 17807, 109158, 585339, 2805752, 12209406, 48792492, 180680070, 624410736, 25734764, 199973794, 977710523, 571365953, 412869707, 328237414, 214863466, 633048751, 257394955, 317735309, 673309005, 193600985, 704135816, 514918834, 650479735, 33606857, 490034801, 698396427, 67986999, 220797055, 218864611, 931163713, 940790978, 675674698, 85542051, 543018292, 61247584, 910803604, 831296179, 923943160, 89478028, 104500393, 161998091, 254912705, 539249258, 547749719, 357852173, 690014841, 206926249, 893887199, 747112232, 382059625, 148865046, 301618706, 260333115, 442306036, 247371284, 782005651, 233300621, 920894203, 317455792, 678639547, 427050277, 482884001, 854060466, 980543322, 860769666, 701293636, 771136168, 670745480, 486701027, 168461356, 848787800, 289825171, 498776317, 33320170, 430165721, 821516580, 115533370, 398776967, 333310602, 563097053, 553134182, 219816464, 216637272, 206027601, 933677337, 925510467, 267639197, 43693887, 486722546, 270929495, 877730912, 261947307, 375318068, 692508932, 989184491, 226696206, 288508969, 739837562, 849035543, 782296408, 273955665, 801085382, 431898190, 935043965, 202752072, 867866169, 151133676, 67940990, 78118516, 742654574, 165553271, 254022475, 668960857, 929973305, 656759571, 877339826, 925206924, 133648890, 623964326, 796176354, 256442424, 844384225, 955053908, 35821657, 33969824, 328610099, 171474448, 265634834, 954990510]
ans[24]= [1, 23, 297, 2779, 20859, 132473, 735535, 3649437, 16435370, 67971642, 260491974, 931772466, 129241853, 915880695, 773220207, 21124907, 663657824, 89235883, 562087424, 395633225, 79602143, 818737728, 503346111, 923762587, 810187543, 71950684, 872552891, 722894374, 788701216, 792043650, 839896539, 577542972, 345484502, 350106805, 159630680, 594479078, 806985602, 451202244, 562057157, 345406448, 404888318, 371479292, 122121086, 196184273, 855722413, 625056343, 209132008, 580725504, 234791519, 683270249, 879431955, 820639155, 890517789, 877206124, 780147370, 943542736, 532169988, 134361777, 389279830, 486085405, 212150153, 60309713, 36144061, 220641769, 167907687, 433032241, 672669299, 4840381, 543970499, 860603358, 920463673, 899153827, 269139419, 99866794, 833550296, 732963165, 649634036, 220976898, 948879986, 81746947, 249278044, 943429751, 227240067, 617290217, 857759442, 317672542, 702411387, 392102340, 598392406, 771484657, 20769431, 772211314, 777981688, 103043307, 336611982, 922346108, 46010568, 620920750, 740298345, 143296430, 127113300, 229361025, 452883985, 298773134, 583669967, 430943791, 878469881, 498554889, 377075156, 399618101, 518539100, 610655946, 762624102, 339746521, 193491143, 582788075, 58498274, 139175929, 439487543, 659039143, 969039085, 205473123, 149794944, 735361805, 144310487, 952281582, 885994682, 290034640, 449859219, 870975475, 717604104, 930837761, 466542500, 510501275, 368063612, 61813298, 959329905, 938922014, 660077190, 12025968, 335011033, 657136343, 351072920, 964781583, 196462283]
ans[25]= [1, 24, 322, 3124, 24280, 159528, 915834, 4696644, 21857553, 93405656, 369882084, 367190881, 745178532, 541448535, 237690972, 408537702, 191376116, 678513161, 493570976, 397907192, 9101765, 658714208, 122356973, 514532531, 911169029, 6916896, 782796, 910119724, 942560918, 62371227, 773940129, 523667340, 669757203, 42568262, 891666384, 467022993, 486796667, 727294526, 413613585, 787453753, 599953158, 417187968, 359849625, 117069116, 879478181, 12380000, 910899870, 838986319, 102687453, 103327364, 376800830, 429223538, 780159138, 706916356, 587575355, 971169352, 36010810, 483798044, 344462034, 787276711, 359714668, 737585540, 514856433, 506547585, 7966248, 935961, 931790046, 725219981, 437246235, 737823353, 539625329, 101294921, 998345360, 158678756, 14552916, 434899855, 58679632, 771567929, 908041362, 370603042, 958461645, 473954165, 329932246, 645017860, 950250115, 632956030, 39737256, 308287817, 593859369, 848980890, 73354610, 67983312, 794665532, 744501399, 571146358, 79777328, 768540650, 301591668, 87146707, 749547055, 542914952, 113807115, 981646049, 443442346, 689844336, 226785366, 664441023, 644644459, 65534356, 186334852, 433121661, 818953887, 687026114, 344822747, 464015963, 110899493, 294091084, 65199948, 37449794, 719226153, 501099656, 413337315, 725255533, 799293560, 259962068, 954615054, 373654234, 764439094, 914044890, 22085466, 539035590, 698634111, 313016212, 98993468, 941478268, 955683335, 902077766, 420565422, 767959775, 128648986, 355285226, 534029655, 104714136, 932643222, 778200211, 56428536, 225880543, 792355687, 449940761, 181471652, 529937629, 325235521, 6575392, 94094707, 441392085, 37264955, 911557047]
ans[26]= [1, 25, 348, 3496, 28098, 190746, 1130768, 5985744, 28747851, 126764795, 517958180, 975500521, 75313899, 914923483, 611051644, 458281681, 932346365, 712529240, 185024083, 463834094, 950836649, 286357381, 871292163, 434939852, 58330077, 629835295, 27932676, 66354549, 10923173, 590226200, 526183672, 176005584, 809584977, 222348292, 260397896, 396327746, 178971085, 774808076, 78650222, 507195902, 144802453, 299847298, 581537053, 724817078, 350425193, 503589319, 654904119, 595937600, 992781673, 82554146, 868891604, 769490422, 119334199, 287573489, 85347169, 118147346, 949694675, 540939467, 927324362, 545027201, 610310429, 769058023, 21423, 262519735, 786795808, 240407039, 428554518, 447092428, 788617633, 367724192, 374279457, 343082569, 856162651, 150954733, 962857235, 700751807, 895999415, 533537747, 537990547, 268357366, 869434038, 633081543, 603452058, 947934680, 987367826, 743179254, 710352935, 835787228, 706586787, 845202323, 238777269, 405136472, 480736674, 155194042, 871452828, 677921910, 616952227, 984554304, 602482844, 894952109, 161534829, 782737895, 850072208, 670793244, 828100052, 222399146, 284700626, 231919567, 306545173, 673216888, 772842480, 314744315, 347738200, 25002680, 730048408, 649455506, 745857274, 196252843, 529935260, 419302767, 276709210, 732855171, 343508231, 624945362, 861002432, 484757974, 367927715, 209929226, 661865936, 531107025, 413469524, 479519565, 741904536, 610072165, 606639245, 934344602, 716197790, 587584177, 185414563, 306822687, 841034662, 971868532, 919896238, 158358640, 773475266, 936203252, 665923149, 911486615, 197651366, 774528535, 82937079, 883806524, 130206852, 774201811, 995994000, 245370199, 842572718, 793423605, 740588350, 687616120, 657690139, 857790226, 37323118, 88399209, 523321086, 117621631, 71036645, 222192424, 788926021, 202125596]
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ans[50]= [1, 49, 1272, 23124, 329180, 3895908, 39783804, 359447204, 925733384, 746545659, 165655001, 158091124, 719304162, 111160209, 171158550, 935012406, 874008903, 988755604, 608336289, 351327718, 211049418, 970686245, 441380023, 920727544, 396494781, 218114186, 934368772, 753990221, 203263446, 488226646, 946324350, 642441651, 816607227, 122420091, 629716118, 498106515, 488881569, 100763230, 814241373, 430998026, 986590664, 188596813, 238499794, 887765759, 719310391, 819612870, 840885905, 584773429, 811468143, 396065785, 368868801, 299761844, 617462619, 308704442, 206242421, 833439007, 106715469, 970135543, 972244832, 66232618, 207050932, 577078708, 955731123, 103929249, 632790957, 297717977, 280927805, 856143814, 140717794, 889342899, 570959166, 553036683, 311778062, 833874032, 321035571, 629235909, 60666525, 19636232, 889773198, 837811568, 283828621, 499062871, 459250525, 468391935, 389843786, 80632526, 462481073, 859711240, 66143264, 831825780, 518914304, 998480225, 496960804, 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if K%2 == 1 or len(ans[N])*2<=K:
    print(0)
else:
    print(ans[N][K//2])