a(n) = A002627(n+1) - A002627(n) - n!.

Terms

a(0) =0a(1) =1a(2) =5a(3) =25a(4) =141a(5) =911a(6) =6703a(7) =55581a(8) =513929a(9) =5248891a(10) =58724211a(11) =714554633a(12) =9397715341a(13) =132870076119