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

Terms

a(0) =0a(1) =1a(2) =0a(3) =-1a(4) =12a(5) =-34a(6) =120a(7) =146a(8) =-2352a(9) =23848a(10) =-53280a(11) =-371768a(12) =12223200a(13) =-107535440a(14) =706340544a(15) =2599870352a(16) =-95898673920