98329108

Appears in sequences

• Second-order Euler numbers.at n=11A002435
• Triangle read by rows: T(n,k) = value of (d^2n/dx^2n) (tan^(2k)(x)/cos(x)) at the point x = 0.at n=22A151775
• E.g.f.: sec(x)^2*tan(x)+sec(x)*tan(x)^2.at n=12A225689
• E.g.f. C(x,y) = cos(y) / sqrt(1 - sin(x)^2 - sin(y)^2).at n=29A324609
• E.g.f. C(y,x) = cos(x) / sqrt(1 - sin(x)^2 - sin(y)^2).at n=34A324611