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

Terms

a(0) =1a(1) =-1a(2) =2a(3) =-4a(4) =4a(5) =4a(6) =-32a(7) =104a(8) =-48a(9) =-1360a(10) =5600a(11) =-1024a(12) =-85568a(13) =494272a(14) =-533504a(15) =-13790848a(16) =85827840a(17) =68726528a(18) =-3149702656a(19) =15167771648a(20) =27282224128a(21) =-993154165760