E.g.f.: exp(1 / (2 - sec(x)) - 1) (even powers only).

A331612

E.g.f.: exp(1 / (2 - sec(x)) - 1) (even powers only).

Terms

    a(0) =1a(1) =1a(2) =14a(3) =481a(4) =30449a(5) =3064306a(6) =448104029a(7) =89621046061

External references