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

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =16a(5) =80a(6) =520a(7) =3640a(8) =29120a(9) =259840a(10) =2598400a(11) =28582400a(12) =343235200a(13) =4462057600a(14) =62468806400a(15) =936987251200