using System;
using System.Linq;
using System.Collections.Generic;
using System.Diagnostics;
using Debug = System.Diagnostics.Trace;
using SB = System.Text.StringBuilder;
using System.Numerics;
using static System.Math;
using Number = System.Int32;
namespace Program {
	public class Solver {
		Random rnd = new Random();
		public void Solve() {
			var N = ri;
			var K = ri;
			if (N == 0) {
				if (K == 0) Console.WriteLine(1);
				else Console.WriteLine(0);
				return;
			}
			const long M = (long)1e9 + 7;
			//dp[n][k][i][j] = n 個見て、奇妙さが k, 右に向かって伸びている辺の個数が i, 右から伸びている辺の本数が j のような順列の個数
			//dp[n+1][k+i+j][i][j](自己ループ)
			//dp[n+1][k+i+j][i+1][j+1](右に伸びて、右から入る)
			//dp[n+1][k+i+j][i][j](右に伸びて、左から入る)
			//dp[n+1][k+i+j][i][j](左に伸びて、右から入る)
			//dp[n+1][k+i+j][i-1][j-1](左に伸びて、左から入る)

			var dp = Enumerate(K + 2 * N + 5, x => new long[N + 5]);
			dp[0][0] = 1;
			for (int n = 0; n < N; n++) {
				var next = Enumerate(K + 2 * N + 5, x => new long[N + 5]);
				for (int k = 0; k <= K; k++) {
					for (int i = 0; i <= N; i++) {
						if (dp[k][i] == 0) continue;
						Debug.WriteLine($"{n} {k} {i} {dp[k][i]}");
						next[k + 2 * i][i] = (next[k + 2 * i][i] + dp[k][i]) % M;
						if (n == 0) {
							next[k + 2 * i][i + 1] = (next[k + 2 * i][i + 1] + dp[k][i]) % M;
						}
						else if (n == N - 1) {
							if (i != 0)
								next[k + 2 * i][i - 1] = (next[k + 2 * i][i - 1] + i * i * dp[k][i]) % M;
						}
						else {
							if (i != 0)
								next[k + 2 * i][i] = (next[k + 2 * i][i] + 2 * i * dp[k][i]) % M;
							next[k + 2 * i][i + 1] = (next[k + 2 * i][i + 1] + dp[k][i]) % M;
							if (i != 0)
								next[k + 2 * i][i - 1] = (next[k + 2 * i][i - 1] + i * i * dp[k][i]) % M;
						}
					}
				}
				dp = next;
			}
			Console.WriteLine(dp[K][0]);
		}

		const long INF = 1L << 60;
		static int[] dx = { -1, 0, 1, 0 };
		static int[] dy = { 0, 1, 0, -1 };
		int ri { get { return sc.Integer(); } }
		long rl { get { return sc.Long(); } }
		double rd { get { return sc.Double(); } }
		string rs { get { return sc.Scan(); } }
		public IO.StreamScanner sc = new IO.StreamScanner(Console.OpenStandardInput());

		static T[] Enumerate<T>(int n, Func<int, T> f) {
			var a = new T[n];
			for (int i = 0; i < a.Length; ++i) a[i] = f(i);
			return a;
		}
		static public void Swap<T>(ref T a, ref T b) { var tmp = a; a = b; b = tmp; }
	}
}

#region main
static class Ex {
	static public string AsString(this IEnumerable<char> ie) { return new string(ie.ToArray()); }
	static public string AsJoinedString<T>(this IEnumerable<T> ie, string st = " ") {
		return string.Join(st, ie);
	}
	static public void Main() {
		Console.SetOut(new Program.IO.Printer(Console.OpenStandardOutput()) { AutoFlush = false });
		var solver = new Program.Solver();
		var t = new System.Threading.Thread(solver.Solve, 10000000);
		t.Start();
		t.Join();
		//solver.Solve();
		Console.Out.Flush();
	}
}
#endregion
#region Ex
namespace Program.IO {
	using System.IO;
	using System.Text;
	using System.Globalization;

	public class Printer : StreamWriter {
		public override IFormatProvider FormatProvider { get { return CultureInfo.InvariantCulture; } }
		public Printer(Stream stream) : base(stream, new UTF8Encoding(false, true)) { }
	}

	public class StreamScanner {
		public StreamScanner(Stream stream) { str = stream; }

		public readonly Stream str;
		private readonly byte[] buf = new byte[1024];
		private int len, ptr;
		public bool isEof = false;
		public bool IsEndOfStream { get { return isEof; } }

		private byte read() {
			if (isEof) return 0;
			if (ptr >= len) {
				ptr = 0;
				if ((len = str.Read(buf, 0, 1024)) <= 0) {
					isEof = true;
					return 0;
				}
			}
			return buf[ptr++];
		}

		public char Char() {
			byte b = 0;
			do b = read(); while ((b < 33 || 126 < b) && !isEof);
			return (char)b;
		}
		public string Scan() {
			var sb = new StringBuilder();
			for (var b = Char(); b >= 33 && b <= 126; b = (char)read()) sb.Append(b);
			return sb.ToString();
		}
		public string ScanLine() {
			var sb = new StringBuilder();
			for (var b = Char(); b != '\n' && b != 0; b = (char)read()) if (b != '\r') sb.Append(b);
			return sb.ToString();
		}
		public long Long() { return isEof ? long.MinValue : long.Parse(Scan()); }
		public int Integer() { return isEof ? int.MinValue : int.Parse(Scan()); }
		public double Double() { return isEof ? double.NaN : double.Parse(Scan(), CultureInfo.InvariantCulture); }
	}
}

#endregion


Measured memory_bytes: 36328