Expansion of e.g.f. tanh(log(x+1) - arctan(x)).

Terms

a(0) =0a(1) =0a(2) =-1a(3) =4a(4) =-6a(5) =0a(6) =-90a(7) =600a(8) =6440a(9) =-96320a(10) =289800a(11) =-583200a(12) =83754000a(13) =-1139424000a(14) =-2961758800a(15) =128868376000