Expansion of e.g.f. exp(sec(x)*exp(x) - 1).

Terms

a(0) =1a(1) =1a(2) =3a(3) =11a(4) =53a(5) =297a(6) =1959a(7) =14499a(8) =120409a(9) =1097025a(10) =10931771a(11) =117685163a(12) =1363889133a(13) =16887554569a(14) =222672557631