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

A122399

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

Terms

    a(0) =1a(1) =1a(2) =9a(3) =211a(4) =9285a(5) =658171a(6) =68504709a(7) =9837380491

External references