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

Terms

a(0) =1a(1) =0a(2) =0a(3) =2a(4) =24a(5) =240a(6) =2440a(7) =26880a(8) =329280a(9) =4518080a(10) =69148800a(11) =1168675200a(12) =21564188800a(13) =430048819200