49164554domain: NAppears in sequencesRelated to Euler numbers, expansion of e.g.f. sec(x)*tan^2(x).at n=9A002735Triangle of numbers related to A000330 (sum of squares) and A000364 (Euler numbers).at n=33A060058Triangle A060058 by diagonals.at n=30A060074Third column of triangle A060074.at n=5A060075