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

Terms

a(0) =0a(1) =1a(2) =-1a(3) =2a(4) =-6a(5) =16a(6) =0a(7) =-792a(8) =13776a(9) =-200552a(10) =2855880a(11) =-41436352a(12) =620388912a(13) =-9606956592a(14) =153409074000