a(n) = n! - A000800(n).

Terms

a(0) =0a(1) =0a(2) =1a(3) =4a(4) =19a(5) =107a(6) =682a(7) =4915a(8) =39871a(9) =361138a(10) =3621531a(11) =39884367a(12) =478847750a(13) =6226248403a(14) =87174202427