5924217936

Appears in sequences

• a(n) = (2*n)!*(2*n+1)! / (n! * (n+1)!)^2.at n=10A000891
• a(n) is the number of n-step walks on square lattice such that 0 <= y <= x at each step.at n=20A005558
• Moment sequence of tr(A^2) in USp(4).at n=20A138350
• a(n) = binomial(m+n-1,n)^2 - binomial(m+n,n+1)*binomial(m+n-2,n-1) with m=12.at n=10A140925
• Number of 10 X 10 matrices with elements in 0..n with each row and each column in nondecreasing order. 10,10,n can be permuted, see formula.at n=2A140933