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

Terms

a(0) =1a(1) =-2a(2) =1a(3) =6a(4) =-2a(5) =-58a(6) =-91a(7) =732a(8) =4365a(9) =-1468a(10) =-140682a(11) =-685886a(12) =1791101a(13) =43923266a(14) =216543097a(15) =-939472974a(16) =-22047365454a(17) =-127801626362a(18) =541608607233