Expansion of e.g.f.: exp(-x - x^2/2 + x*exp(x)).

Terms

a(0) =1a(1) =0a(2) =1a(3) =3a(4) =7a(5) =35a(6) =171a(7) =847a(8) =5041a(9) =32643a(10) =223705a(11) =1659581a(12) =13182159a(13) =110802133a(14) =984241363a(15) =9212696235a(16) =90477239521a(17) =929604133343