54276473326domain: NAppears in sequencesGeneralized tangent numbers d(3, n).at n=5A000191Expansion of e.g.f. (sin(2*x) + cos(x)) / cos(3*x).at n=11A007289Shanks's array d_{a,n} (a >= 1, n >= 1) that generalizes the tangent numbers, read by antidiagonals upwards.at n=33A235606