Expansion of e.g.f.: cosh(x)/exp(sin(x)).

Terms

a(0) =1a(1) =-1a(2) =2a(3) =-3a(4) =4a(5) =3a(6) =-32a(7) =105a(8) =-48a(9) =-1081a(10) =5600a(11) =-5643a(12) =-85568a(13) =547467a(14) =-533504a(15) =-12925983a(16) =85827840a(17) =-21466225a(18) =-3149702656a(19) =19155660141a(20) =27282224128