a(n) = n^n - n!.

Terms

a(0) =0a(1) =0a(2) =2a(3) =21a(4) =232a(5) =3005a(6) =45936a(7) =818503a(8) =16736896a(9) =387057609a(10) =9996371200a(11) =285271753811