a(n) = A030019(n)*n! (or A035051*(n-1)!).

A030438

a(n) = A030019(n)*n! (or A035051*(n-1)!).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =24a(4) =696a(5) =37320a(6) =3201840a(7) =401914800a(8) =69458497920

External references