Expansion of e.g.f. arctanh(log(x+1) - tanh(x)).

Terms

a(0) =0a(1) =0a(2) =-1a(3) =4a(4) =-6a(5) =8a(6) =-150a(7) =1832a(8) =-16520a(9) =134752a(10) =-1214640a(11) =15556352a(12) =-248089248a(13) =3892532096a(14) =-58976309392a(15) =950047701696