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

Terms

a(0) =0a(1) =1a(2) =-1a(3) =1a(4) =-12a(5) =55a(6) =-255a(7) =2679a(8) =-23632a(9) =201245a(10) =-2409525a(11) =30433181a(12) =-383307804a(13) =5609915779a(14) =-89478694851