Expansion of e.g.f. exp(1 - x - exp(3*x)).

Terms

a(0) =1a(1) =-4a(2) =7a(3) =17a(4) =-14a(5) =-637a(6) =-2951a(7) =14126a(8) =333205a(9) =2076245a(10) =-12283700a(11) =-423234511a(12) =-4163106203a(13) =8148184700a(14) =952894223755