Expansion of e.g.f.: tanh(log(1+x)^2).

Terms

a(0) =0a(1) =0a(2) =2a(3) =-6a(4) =22a(5) =-100a(6) =308a(7) =1512a(8) =-51144a(9) =869472a(10) =-12648528a(11) =168624720a(12) =-2029008720a(13) =19500193440a(14) =-52358834400