147486domain: NAppears in sequencesNumber of (2+1) X (n+1) 0..1 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=14A253436Number of edges in an equilateral triangle "frame" of size n (see Comments in A328526 for definition).at n=19A333030