-16216590domain: ZAppears in sequencesa(n) = n! * [x^n] (x * tanh(x) * sech(x)) / 2.at n=12A326719Triangle with Euler (secant) numbers, read by rows, T(n, k) for 0 <= k <= n.at n=22A326724Triangle with Euler (secant) numbers, read by rows, T(n, k) for 0 <= k <= n.at n=26A326724