Expansion of tanh(log(1+tan(x))).

Terms

a(0) =0a(1) =1a(2) =-1a(3) =2a(4) =-2a(5) =-14a(6) =194a(7) =-1828a(8) =15688a(9) =-130664a(10) =1037864a(11) =-7421008a(12) =36772528a(13) =153779536a(14) =-9259356016a(15) =209102239712