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