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

Terms

a(0) =1a(1) =0a(2) =0a(3) =6a(4) =12a(5) =-80a(6) =540a(7) =3528a(8) =-35280a(9) =82080a(10) =3346560a(11) =-33153120a(12) =-82257120a(13) =6269253120a(14) =-54446648256a(15) =-587596363200