Expansion of e.g.f. log((-1+x)/(-1+x+x^2)).

Terms

a(0) =0a(1) =0a(2) =2a(3) =6a(4) =36a(5) =240a(6) =2040a(7) =20160a(8) =231840a(9) =3024000a(10) =44271360a(11) =718502400a(12) =12813292800a(13) =249080832000