a(n) = Sum_{k=1..n} k! * k^(n-2) * Stirling2(n,k).

A373873

a(n) = Sum_{k=1..n} k! * k^(n-2) * Stirling2(n,k).

Terms

    a(0) =0a(1) =1a(2) =3a(3) =31a(4) =765a(5) =34651a(6) =2502213a(7) =263824891a(8) =38248036725

External references