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

A256016

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

Terms

    a(0) =1a(1) =1a(2) =6a(3) =57a(4) =796a(5) =15145a(6) =374526a(7) =11669665a(8) =447595800a(9) =20733553809

External references