a(n) = Sum_{k=1..n} k! * k^(n-1) * Stirling1(n,k).

A373857

a(n) = Sum_{k=1..n} k! * k^(n-1) * Stirling1(n,k).

Terms

    a(0) =0a(1) =1a(2) =3a(3) =32a(4) =734a(5) =28994a(6) =1752046a(7) =150262104a(8) =17356844088

External references