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

Terms

a(0) =0a(1) =0a(2) =-1a(3) =0a(4) =-6a(5) =8a(6) =-150a(7) =448a(8) =-7560a(9) =38432a(10) =-650160a(11) =4827328a(12) =-85887648a(13) =855019904a(14) =-16230758544a(15) =204362847232