74487

Appears in sequences

• Triangle, read by rows, where T(n,k) = T(n,k-1) + (k+1)*T(n-1,k) for n>k>0, T(n,0)=1 and T(n,n) = T(n,n-1) for n>=0.at n=39A102316
• a(n) = 169*n^2 - 2*n.at n=20A158218