Expansion of e.g.f. exp(1 - sec(x)) (even powers only).

A331818

Expansion of e.g.f. exp(1 - sec(x)) (even powers only).

Terms

    a(0) =1a(1) =-1a(2) =-2a(3) =-1a(4) =253a(5) =12854a(6) =668053a(7) =39148199a(8) =2456262898a(9) =130790155859

External references