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

Terms

a(0) =0a(1) =1a(2) =0a(3) =-5a(4) =12a(5) =6a(6) =-120a(7) =442a(8) =-2352a(9) =13192a(10) =53280a(11) =-1665432a(12) =12223200a(13) =-6629648a(14) =-706340544a(15) =9387463888a(16) =-95898673920a(17) =563447710848