452760

Appears in sequences

• Total dimension of the homology of a free 2-step nilpotent Lie algebra of rank n.at n=5A078973
• Number of n X 7 0..1 arrays avoiding 0 0 0 and 1 1 1 horizontally and 0 0 1 and 1 0 1 vertically.at n=14A208378
• Number of ascent sequences of length n with exactly four flat steps.at n=7A242157
• Numbers whose sum of divisors is the cube of one of their divisors.at n=8A303993
• Regular triangle T(n,k) = binomial(2*n-2*k,n-k)*((n+1)/k)*Sum_{k=0..floor((k-1)/2)} (-1)^k*binomial(2*k,k)*binomial(n+3*k-2*k,k-2*k-1), read by rows.at n=38A306625