Derangement numbers d(n,3) 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.

A033030

Derangement numbers d(n,3) 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) =3a(3) =18a(4) =189a(5) =2484a(6) =40095a(7) =766422a(8) =16936857a(9) =424878696a(10) =11929019931a(11) =370616958810

External references