Expansion of e.g.f.: 1/(exp(x)*(2-exp(x))).

Terms

a(0) =1a(1) =0a(2) =2a(3) =6a(4) =38a(5) =270a(6) =2342a(7) =23646a(8) =272918a(9) =3543630a(10) =51123782a(11) =811316286a(12) =14045783798a(13) =263429174190