a(n) = sum(Stirling2(n,k)*Stirling2(n+1,k+1)*Stirling2(n+2,k+2),k=0..n).

A192568

a(n) = sum(Stirling2(n,k)*Stirling2(n+1,k+1)*Stirling2(n+2,k+2),k=0..n).

Terms

    a(0) =1a(1) =1a(2) =19a(3) =356a(4) =13626a(5) =712482a(6) =51437310a(7) =5021800835a(8) =618616762763

External references