a(n) = n! - (n-th Bell number).

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =9a(5) =68a(6) =517a(7) =4163a(8) =36180a(9) =341733a(10) =3512825a(11) =39238230a(12) =474788003a(13) =6199376363a(14) =86987391878