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

Terms

a(0) =0a(1) =0a(2) =2a(3) =-3a(4) =0a(5) =-10a(6) =-80a(7) =1764a(8) =-7392a(9) =17856a(10) =-41792a(11) =-7382320a(12) =134784320a(13) =-1068379104a(14) =7660192384a(15) =35293839840