Expansion of log(1+tan(x)/cosh(x)).

Terms

a(0) =0a(1) =1a(2) =-1a(3) =1a(4) =-2a(5) =25a(6) =-136a(7) =761a(8) =-4752a(9) =42065a(10) =-386176a(11) =3898321a(12) =-42551552a(13) =521329705a(14) =-6816879616a(15) =96017526281