#define  _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <algorithm>
#include <utility>
#include <functional>
#include <cstring>
#include <queue>
#include <stack>
#include <math.h>
#include <iterator>
#include <vector>
#include <string>
#include <set>
#include <math.h>
#include <iostream>
#include <random>
#include<map>
#include <iomanip>
#include <time.h>
#include <stdlib.h>
#include <list>
#include <typeinfo>
#include <list>
#include <set>
#include <cassert>
#include<fstream>
#include <unordered_map>
#include <cstdlib>
#include <complex>
#include <cctype>
#include <bitset>
using namespace std;
typedef string::const_iterator State;
#define Ma_PI 3.141592653589793
#define eps 0.00000001
#define LONG_INF 1e18
#define GOLD 1.61803398874989484820458
#define MAX_MOD 1000000007
#define MOD 1000000009
#define seg_size 262144
#define REP(a,b) for(long long a = 0;a < b;++a)
vector<complex<double>>  DFT(vector<complex<double>> a) {
	int n = a.size();
	if (n == 1) return a;
	vector<complex<double>> a0(n / 2), a1(n / 2);
	REP(i, n) {
		if (i % 2 == 0) {
			a0[i / 2] = a[i];
		}
		else {
			a1[i / 2] = a[i];
		}
	}
	vector<complex<double>> inversed_a0 = DFT(a0), inversed_a1 = DFT(a1);
	vector<complex<double>> inversed_a(n);
	for (int i = 0; i < n; ++i) {
		complex<double> zeta = complex<double>(cos(2 * Ma_PI * i / n), sin(2 * Ma_PI * i / n));
		inversed_a[i] = inversed_a0[i % (n / 2)] + zeta * inversed_a1[i % (n / 2)];
	}
	return inversed_a;
}
vector<complex<double>> IDFT(vector<complex<double>> inversed_a) {
	int n = inversed_a.size();
	vector<complex<double>> now = DFT(inversed_a);
	reverse(now.begin(), now.end());
	for (int q = now.size() - 1; q >= 1; --q) {
		swap(now[q], now[q - 1]);
	}
	REP(i, n) {
		now[i] /= complex<double>(n, 0);
	}
	return now;
}
vector<complex<double>> conv(vector<complex<double>> a, vector<complex<double>> b) {
	int deg = a.size() + b.size() - 1;
	int n = 1;
	while (n < deg) n <<= 1;
	a.resize(n);
	b.resize(n);
	vector<complex<double>> inversed_a = DFT(a), inversed_b = DFT(b);
	vector<complex<double>> inversed_c(n);
	REP(i, n) {
		inversed_c[i] = inversed_a[i] * inversed_b[i];
	}
	return IDFT(inversed_c);
}
long long powing(long long now, long long hoge) {
	long long ans = 1;
	while (hoge != 0) {
		if (hoge % 2 == 1) {
			ans *= now;
			ans %= MOD;
		}
		hoge /= 2;
		now *= now;
		now %= MOD;
	}
	return ans;
}
long long inv(long long now) {
	return powing(now, MAX_MOD - 2LL);
}
unsigned long xor128() {
	static unsigned long x = 123456789, y = 362436069, z = 521288629, w = 88675123;
	unsigned long t = (x^(x << 11));
	x = y; y = z; z = w;
	return (w = (w^(w >> 19))^(t^(t >> 8)));
}
long long dp[52][52][2501] = {};
int main() {
	int n, k;
	cin >> n >> k;
	dp[0][0][0] = 1;
	for (int i = 1; i <= n; ++i) {
		for (int q = 0; q <= n; ++q) {
			for (int j = 0; j <= 2500; ++j) {
				if (j - q * 2 >= 0) {
					if (q - 1>= 0) {
						dp[i][q][j] += dp[i - 1][q - 1][j - q * 2];
					}
					dp[i][q][j] += (2 * q + 1) * dp[i - 1][q][j - q * 2] % MAX_MOD;
					dp[i][q][j] += (q + 1) * (q + 1) * dp[i - 1][q + 1][j - q * 2] % MAX_MOD;
					dp[i][q][j] %= MAX_MOD;
				}
			}
		}
	}
	cout << dp[n][0][k] << endl;
	return 0;
}

Measured memory_bytes: 51072