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

Terms

a(0) =0a(1) =1a(2) =0a(3) =3a(4) =4a(5) =65a(6) =306a(7) =4207a(8) =38424a(9) =573057a(10) =7753510a(11) =134046671a(12) =2353898196a(13) =47602871329