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

Terms

a(0) =0a(1) =0a(2) =1a(3) =-3a(4) =11a(5) =-50a(6) =154a(7) =756a(8) =-25572a(9) =434736a(10) =-6324264a(11) =84312360a(12) =-1014504360a(13) =9750096720a(14) =-26179417200