Expansion of exp(x)/cosh(sinh(x)).

Terms

a(0) =1a(1) =1a(2) =0a(3) =-2a(4) =-4a(5) =-4a(6) =24a(7) =176a(8) =272a(9) =-1712a(10) =-14528a(11) =-66912a(12) =181312a(13) =4737344a(14) =20265088a(15) =-53926656a(16) =-1771263744a(17) =-18559434496a(18) =4388386816