1951153920

Appears in sequences

• Generalized tangent numbers d_(n,4).at n=8A000518
• Generalized tangent number d(9,n).at n=3A064074
• Generalized Euler numbers, a(n) = n!*[x^n](sec(9*x)*(4*sin(3*x) + 2)*cos(3*x)^2).at n=7A349268