E.g.f.: -log(1-x)/(1+LambertW(-x)).

Terms

a(0) =0a(1) =1a(2) =3a(3) =17a(4) =146a(5) =1684a(6) =24294a(7) =419383a(8) =8412760a(9) =192078864a(10) =4914973770a(11) =139265564723