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

Terms

a(0) =0a(1) =1a(2) =-2a(3) =5a(4) =-11a(5) =-16a(6) =656a(7) =-9066a(8) =107766a(9) =-1222110a(10) =13400544a(11) =-137979810a(12) =1199045706a(13) =-4684987308a(14) =-153270916044