Expansion of log(1+sinh(tanh(x))).

Terms

a(0) =0a(1) =1a(2) =-1a(3) =1a(4) =-2a(5) =1a(6) =8a(7) =169a(8) =-1360a(9) =-1823a(10) =36096a(11) =365905a(12) =-4324608a(13) =-17126303a(14) =252720128a(15) =3688466617a(16) =-44566194176a(17) =-393996411839