47378857957domain: NAppears in sequencesExpansion of e.g.f.: 1/cos(tan(x)) (even-indexed coefficients only).at n=7A009010Numerator of [x^(2n)] of the Taylor expansion sec(cosec(x)-cot(x)) = 1+ x^2/8 +13*x^4/384 +397*x^6/46080 +4453*x^8/2064384 + ... .at n=7A013527