Expansion of e.g.f. (1 + x^3 + x^4)^x.

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =24a(5) =120a(6) =0a(7) =-2520a(8) =-20160a(9) =181440a(10) =3024000a(11) =19958400a(12) =-159667200a(13) =-5708102400a(14) =-47221574400a(15) =326918592000