Expansion of e.g.f. exp(x^3/6 * (1 + x)^2).

Terms

a(0) =1a(1) =0a(2) =0a(3) =1a(4) =8a(5) =20a(6) =10a(7) =280a(8) =3360a(9) =20440a(10) =67200a(11) =462000a(12) =7407400a(13) =73673600a(14) =482081600a(15) =3364761400a(16) =47311264000a(17) =657536880000