a(n) = Sum_{k=0..n} (k-1)^n*k!*Stirling2(n,k).

A122418

a(n) = Sum_{k=0..n} (k-1)^n*k!*Stirling2(n,k).

Terms

    a(0) =1a(1) =0a(2) =2a(3) =54a(4) =2534a(5) =186030a(6) =19794662a(7) =2885980734a(8) =552803552534

External references