E.g.f.: exp(1/3! * x^3 * exp(-x)).

Terms

a(0) =1a(1) =0a(2) =0a(3) =1a(4) =-4a(5) =10a(6) =-10a(7) =-105a(8) =1064a(9) =-6356a(10) =25080a(11) =-9075a(12) =-1056660a(13) =13219206a(14) =-106106364a(15) =548948855a(16) =139658960a(17) =-48411569800a(18) =761039099824