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

Terms

a(0) =1a(1) =0a(2) =1a(3) =4a(4) =21a(5) =115a(6) =712a(7) =5027a(8) =40299a(9) =362846a(10) =3628745a(11) =39916711a(12) =479001456a(13) =6227020567a(14) =87178290823