Generalized Euler numbers, a(n) = n!*[x^n](sec(8*x)*2*(sin(4*x) + cos(4*x))).

A349267

Generalized Euler numbers, a(n) = n!*[x^n](sec(8*x)*2*(sin(4*x) + cos(4*x))).

Terms

    a(0) =2a(1) =8a(2) =96a(3) =1408a(4) =29184a(5) =739328a(6) =22634496a(7) =806453248a(8) =32864600064

External references