123810

Appears in sequences

• Number of permutations of [n] having exactly 5 strong fixed blocks.at n=5A225966
• Square array T(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where T(n,k) = [x^n] 1/(1 - x*(1+x)^k)^n.at n=62A362078
• a(n) = Sum_{k=0..n} (-1)^k * binomial(-n,k) * binomial(3*k,n-k).at n=7A362088