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

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =9a(5) =45a(6) =225a(7) =1071a(8) =6993a(9) =56697a(10) =467745a(11) =3279419a(12) =29529753a(13) =376156261a(14) =4297350785a(15) =35274762407a(16) =378759492257