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

Terms

a(0) =0a(1) =1a(2) =-1a(3) =1a(4) =-12a(5) =95a(6) =-615a(7) =5003a(8) =-52192a(9) =600029a(10) =-7464645a(11) =102853749a(12) =-1558643724a(13) =25565811531a(14) =-450966117147