Expansion of e.g.f. sec(x*sec(x)) (even powers only).

A296790

Expansion of e.g.f. sec(x*sec(x)) (even powers only).

Terms

    a(0) =1a(1) =1a(2) =17a(3) =601a(4) =38849a(5) =4022641a(6) =609933521a(7) =127391254537

External references