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

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =20a(5) =100a(6) =610a(7) =4270a(8) =34160a(9) =307160a(10) =3071600a(11) =33787600a(12) =405466600a(13) =5271065800a(14) =73794921200