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

Terms

a(0) =0a(1) =1a(2) =-1a(3) =-3a(4) =14a(5) =-15a(6) =-136a(7) =1197a(8) =-5776a(9) =-255a(10) =420224a(11) =-5448003a(12) =30166784a(13) =241437105a(14) =-8354415616a(15) =104019879597a(16) =-291139373056