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

Terms

a(0) =1a(1) =-2a(2) =2a(3) =1a(4) =0a(5) =-17a(6) =-32a(7) =103a(8) =976a(9) =2287a(10) =-12816a(11) =-143585a(12) =-481016a(13) =2339335a(14) =39769720a(15) =209863327a(16) =-397553376a(17) =-16949434913a(18) =-142681662368a(19) =-233212601153