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

Terms

a(0) =1a(1) =1a(2) =1a(3) =0a(4) =-3a(5) =-9a(6) =-9a(7) =36a(8) =225a(9) =477a(10) =-819a(11) =-10944a(12) =-37179a(13) =16875a(14) =870507a(15) =4253796a(16) =2481921a(17) =-101978919a(18) =-680495175a(19) =-1060229088a(20) =16378166061a(21) =145672249311a(22) =368320357791