Expansion of log(1+tan(x)/cos(x)).

Terms

a(0) =0a(1) =1a(2) =-1a(3) =7a(4) =-26a(5) =185a(6) =-1336a(7) =12367a(8) =-129296a(9) =1558865a(10) =-21045376a(11) =316097527a(12) =-5218370816a(13) =94003171145