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

Terms

a(0) =1a(1) =2a(2) =4a(3) =16a(4) =94a(5) =718a(6) =6698a(7) =73512a(8) =925944a(9) =13149408a(10) =207723792a(11) =3611861856a(12) =68535403440