Expansion of the e.g.f. exp(-1 + (1 + x)*exp(-x)).

Terms

a(0) =1a(1) =0a(2) =-1a(3) =2a(4) =0a(5) =-16a(6) =65a(7) =-78a(8) =-749a(9) =6232a(10) =-22068a(11) =-28920a(12) =1004685a(13) =-7408740a(14) =22263215a(15) =157632230a(16) =-2874256740a(17) =21590948480a(18) =-53087332675a(19) =-956539294506