4987800

Appears in sequences

• Number of ways to place 9 points on an n X n board so that no more than 2 points are on a vertical or horizontal straight line.at n=5A279443
• Triangle read by rows: T(n, k) is the number of ways to place k points on an n X n square grid so that no more than 2 points are on a vertical or horizontal straight line.at n=43A279445