Derangement numbers d(n,5) 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.

A088992

Derangement numbers d(n,5) 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) =5a(3) =50a(4) =825a(5) =17500a(6) =458125a(7) =14268750a(8) =515440625a(9) =21188375000a(10) =976671703125

External references