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

Terms

a(0) =1a(1) =1a(2) =1a(3) =-5a(4) =-23a(5) =-59a(6) =241a(7) =2311a(8) =9745a(9) =-30743a(10) =-529919a(11) =-3161069a(12) =6984121a(13) =216832045a(14) =1696212337a(15) =-2117117729a(16) =-138721306079a(18) =367573878145