Expansion of e.g.f. sec(tan(x) - tanh(x)) (even-indexed coefficients only).

A013455

Expansion of e.g.f. sec(tan(x) - tanh(x)) (even-indexed coefficients only).

Terms

    a(0) =1a(1) =0a(2) =0a(3) =160a(4) =0a(5) =261120a(6) =19712000a(7) =1538068480a(8) =557613056000

External references