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

Terms

a(0) =1a(1) =-1a(2) =3a(3) =-13a(4) =73a(5) =-501a(6) =4051a(7) =-37633a(8) =394353a(9) =-4596553a(10) =58941091a(11) =-824073141a(12) =12470162233a(13) =-202976401213