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

Terms

a(0) =1a(1) =0a(2) =0a(3) =1a(4) =4a(5) =20a(6) =130a(7) =980a(8) =8400a(9) =80920a(10) =865200a(11) =10164000a(12) =130114600a(13) =1802600800a(14) =26867640800a(15) =428661633400