79483257308
domain: N
Appears in sequences
- a(n) = (2*n)!*(2*n+1)! / (n! * (n+1)!)^2.at n=11A000891
- a(n) is the number of n-step walks on square lattice such that 0 <= y <= x at each step.at n=22A005558
- Moment sequence of tr(A^2) in USp(4).at n=22A138350
- Number of 2 X 11 matrices with elements in 0..n with each row and each column in nondecreasing order. 2,11,n can be permuted, see formula.at n=11A140934
- Number of 11 X 11 matrices with elements in 0..n with each row and each column in nondecreasing order. 11,11,n can be permuted, see formula.at n=2A140943