Generalized Euler numbers, a(n) = n!*[x^n](sec(5*x)*(sin(x) + sin(3*x) + cos(2*x) + cos(4*x))).

A349265

Generalized Euler numbers, a(n) = n!*[x^n](sec(5*x)*(sin(x) + sin(3*x) + cos(2*x) + cos(4*x))).

Terms

    a(0) =2a(1) =4a(2) =30a(3) =272a(4) =3522a(5) =55744a(6) =1066590a(7) =23750912a(8) =604935042a(9) =17328937984a(10) =551609685150

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