a(n) = sum(abs(stirling1(n+1,k+1))*(-1)^(n-k)*k!^2,k=0..n).

A192556

a(n) = sum(abs(stirling1(n+1,k+1))*(-1)^(n-k)*k!^2,k=0..n).

Terms

    a(0) =1a(1) =0a(2) =3a(3) =17a(4) =330a(5) =8074a(6) =295792a(7) =14593424a(8) =939884432a(9) =76503823776

External references