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

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =16a(5) =56a(6) =328a(7) =1576a(8) =12160a(9) =74944a(10) =721280a(11) =5428864a(12) =62638720a(13) =556999808a(14) =7495723264a(15) =76901598208