20734762776
domain: N
Appears in sequences
- a(n) is the number of n-step walks on square lattice such that 0 <= y <= x at each step.at n=21A005558
- Central column of triangle A090181.at n=11A125558
- a(n) = binomial(m+n-1,n)^2 - binomial(m+n,n+1)*binomial(m+n-2,n-1) with m=12.at n=11A140925
- 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=10A140934
- Number of 10 X 11 matrices with elements in 0..n with each row and each column in nondecreasing order. 10,11,n can be permuted, see formula.at n=2A140942