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

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =13a(5) =56a(6) =301a(7) =1688a(8) =11705a(9) =84160a(10) =698521a(11) =6141312a(12) =59340997a(13) =613282944a(14) =6782462597a(15) =80158806016