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

Terms

a(0) =0a(1) =0a(2) =-1a(3) =4a(4) =-6a(5) =0a(6) =-150a(7) =2280a(8) =-16520a(9) =96320a(10) =-1053360a(11) =17870400a(12) =-264765600a(13) =3541824000a(14) =-51903131280a(15) =904820280000