75497508domain: NAppears in sequencesNumber of (n+1) X (2+1) 0..1 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=23A253429Number of pseudo-square convex polyominoes with semiperimeter n.at n=19A320998