Expansion of e.g.f. arctan(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) =282240a(11) =-28800a(12) =63518400a(13) =-658944000a(14) =-11371279920a(15) =255692673600a(16) =-859133808000