Expansion of e.g.f. exp(x^5 * exp(-x)).

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =0a(5) =120a(6) =-720a(7) =2520a(8) =-6720a(9) =15120a(10) =1784160a(11) =-39861360a(12) =478906560a(13) =-4151192760a(14) =29059190160a(15) =43589505960