Expansion of e.g.f. sin(exp(x)-sec(x)).

Terms

a(0) =0a(1) =1a(2) =0a(3) =0a(4) =-4a(5) =-8a(6) =0a(7) =-56a(8) =1136a(9) =-4976a(10) =47040a(11) =-541728a(12) =2460416a(13) =-51170624a(14) =202185984a(15) =-5359238912a(16) =20705351936a(17) =-673408564736