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

Terms

a(0) =0a(1) =0a(2) =-1a(3) =0a(4) =-6a(5) =8a(6) =-90a(7) =448a(8) =-2520a(9) =26336a(10) =-120960a(11) =1722688a(12) =-8914752a(13) =110138624a(14) =-763819056a(15) =2510508544a(16) =-23764540800