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

Terms

a(0) =0a(1) =1a(2) =-1a(3) =7a(4) =-24a(5) =215a(6) =-1515a(7) =16721a(8) =-176568a(9) =2363165a(10) =-32662125a(11) =521810859a(12) =-8824531056a(13) =165050184611