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

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =18a(5) =90a(6) =690a(7) =4830a(8) =40110a(9) =362670a(10) =3628590a(11) =39914490a(12) =478999290a(13) =6226990770a(14) =87178261170