Derangement numbers d(n,4) where d(n,k) = k(n-1)(d(n-1,k) + d(n-2,k)), with d(0,k) = 1 and d(1,k) = 0.

A088991

Derangement numbers d(n,4) where d(n,k) = k(n-1)(d(n-1,k) + d(n-2,k)), with d(0,k) = 1 and d(1,k) = 0.

Terms

    a(0) =1a(1) =0a(2) =4a(3) =32a(4) =432a(5) =7424a(6) =157120a(7) =3949056a(8) =114972928a(9) =3805503488a(10) =141137150976

External references