259161

Appears in sequences

• a(n) = n^2 * (4*n^2 - 1) / 3.at n=21A187756
• Triangle read by rows, T(n,k) = Sum_{j=0..n} (-1)^(n-j)*C(-j,-n)*L(j,k), L the unsigned Lah numbers A271703, for n>=0 and 0<=k<=n.at n=39A271704