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

Terms

a(0) =1a(1) =1a(2) =1a(3) =7a(4) =25a(5) =61a(6) =841a(7) =5251a(8) =20497a(9) =423865a(10) =3780721a(11) =20292031a(12) =559501801a(13) =6487717237a(14) =44317795705