215137

Appears in sequences

• Take an n X n square grid of points in the plane; a(n) = number of ways to divide the points into two sets using a straight line.at n=28A114043
• Number of vertices in a complete bipartite graph where the vertices in the two parts are placed on opposite sides of a parabola at integer y coordinates y = 1, 2, ...n.at n=30A392442