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

Terms

a(0) =0a(1) =1a(2) =0a(3) =5a(4) =-12a(5) =116a(6) =-720a(7) =7048a(8) =-67648a(9) =789124a(10) =-9839520a(11) =137625652a(12) =-2079277200a(13) =34199202272a(14) =-604204537664