Generalized Euler numbers, a(n) = n!*[x^n](sec(4*x)*(sin(4*x) + 1)).

A349264

Generalized Euler numbers, a(n) = n!*[x^n](sec(4*x)*(sin(4*x) + 1)).

Terms

    a(0) =1a(1) =4a(2) =16a(3) =128a(4) =1280a(5) =16384a(6) =249856a(7) =4456448a(8) =90767360a(9) =2080374784a(10) =52975108096

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