53496

Appears in sequences

• Triangle T(n,k) read by rows: T(n,1) = T(n,n)=1, otherwise T(n,k) = (3n-3k+1)*T(n-1,k-1) + k*(3k-2)*T(n-1,k), 1<=k<=n.at n=22A166962
• Number of 2 X 2 matrices having all terms in {-n,...,0,...,n} and determinant > n.at n=8A211151
• Sigma(n)-n values in A085844.at n=32A216383