Expansion of e.g.f. (1 + x^2 + x^3)^x.

Terms

a(0) =1a(1) =0a(2) =0a(3) =6a(4) =24a(5) =-60a(6) =-360a(7) =4200a(8) =40320a(9) =-211680a(10) =-4384800a(11) =11309760a(12) =738460800a(13) =1816214400a(14) =-148445256960