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

Terms

a(0) =0a(1) =1a(2) =-1a(3) =-3a(4) =12a(5) =35a(6) =-435a(7) =-161a(8) =23968a(9) =-68811a(10) =-1874205a(11) =15189361a(12) =177102156a(13) =-3209424153a(14) =-15134777567a(15) =750725838563a(16) =-828777844320