Expansion of e.g.f.: tanh(log(1+x)/exp(x)).

Terms

a(0) =0a(1) =1a(2) =-3a(3) =6a(4) =12a(5) =-325a(6) =3275a(7) =-21238a(8) =2128a(9) =2873229a(10) =-59980543a(11) =767451894a(12) =-4032383300a(13) =-119489497257