E.g.f.: exp(-x * exp(x)).

Terms

a(0) =1a(1) =-1a(2) =-1a(3) =2a(4) =9a(5) =4a(6) =-95a(7) =-414a(8) =49a(9) =10088a(10) =55521a(11) =13870a(12) =-2024759a(13) =-15787188a(14) =-28612415a(15) =616876274a(16) =7476967905a(17) =32522642896a(18) =-209513308607