Expansion of e.g.f.: cosh(log(1+sin(x))).

Terms

a(0) =1a(1) =0a(2) =1a(3) =-3a(4) =8a(5) =-30a(6) =136a(7) =-693a(8) =3968a(9) =-25260a(10) =176896a(11) =-1351383a(12) =11184128a(13) =-99680490a(14) =951878656a(15) =-9695756073a(16) =104932671488