790244domain: NAppears in sequencesNumber of ways to choose three points in an (n X n)-grid (or geoplane).at n=12A178208Quarter-square tetrahedrals: a(n) = k*(k - 1)*(k - 2)/6, k = A002620(n).at n=26A217482Number of ways to choose three points on a centered hexagonal grid of size n.at n=7A240826a(n) = (32*n^3 - 2*n)/3.at n=42A267031