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

Terms

a(0) =1a(1) =0a(2) =-1a(3) =1a(4) =2a(5) =-9a(6) =9a(7) =50a(8) =-267a(9) =413a(10) =2180a(11) =-17731a(12) =50533a(13) =110176a(14) =-1966797a(15) =9938669a(16) =-8638718a(17) =-278475061a(18) =2540956509a(19) =-9816860358a(20) =-27172288399a(21) =725503033401