Expansion of (sin x + cos x)/cos 4x.

Terms

a(0) =1a(1) =1a(2) =15a(3) =47a(4) =1185a(5) =6241a(6) =230895a(7) =1704527a(8) =83860545a(9) =796079041a(10) =48942778575a(11) =567864586607