Expansion of e.g.f. sec(tan(sin(x))), even powers only.

A012148

Expansion of e.g.f. sec(tan(sin(x))), even powers only.

Terms

    a(0) =1a(1) =1a(2) =9a(3) =153a(4) =4337a(5) =188049a(6) =11533497a(7) =947095529a(8) =100391885153

External references