337186domain: NAppears in sequencesNumber of convex quadrilaterals, distinct up to congruence, on an n X n grid (or geoboard).at n=13A181944Number of 4Xn 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 1 1 and 1 1 0 vertically.at n=9A207565