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

Terms

a(0) =1a(1) =0a(2) =0a(3) =1a(4) =4a(5) =0a(6) =10a(7) =140a(8) =560a(9) =280a(10) =8400a(11) =92400a(12) =385000a(13) =800800a(14) =16816800a(15) =169569400a(16) =784784000a(17) =3811808000a(18) =68803134400a(19) =673546473600