a(n) = sum(abs(stirling1(n,k))*stirling2(n+1,k+1)*k!,k=0..n).

A192562

a(n) = sum(abs(stirling1(n,k))*stirling2(n+1,k+1)*k!,k=0..n).

Terms

    a(0) =1a(1) =1a(2) =5a(3) =56a(4) =1024a(5) =27114a(6) =969128a(7) =44610432a(8) =2556362016a(9) =177733575120

External references