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

Terms

a(0) =0a(1) =1a(2) =-1a(3) =7a(4) =-24a(5) =175a(6) =-1155a(7) =10477a(8) =-100968a(9) =1147901a(10) =-14251005a(11) =197307251a(12) =-2969362176a(13) =48613104059a(14) =-856679861583