A334712 Number of ways to select four points from an n X n grid so that three of them form a triangle of nonzero area and the extra point is strictly inside the triangle.

0, 0, 8, 240, 2100, 11604, 45184, 145648, 399656, 976552, 2172328, 4500816, 8736172, 16135996, 28493760, 48400296, 79500936, 126909720, 197253768, 299683032, 445664700, 650291092, 932742112, 1317391344, 1833532544, 2518622024, 3417812896, 4585946096, 6088659404, 8006284316, 10430982968, 13476148160

Offset: 1

Author

N. J. A. Sloane, Jun 15 2020

Keywords

• nonn

Comments

Computed by Tom Duff, Jun 15 2020 - Jun 22 2020

Links

• Tom Duff, Table of n, a(n) for n = 1..192
• Tom Duff, Data for tables A334708, A334709, A334710, A334711 for grids of size up to 192 X 192

Crossrefs

The main diagonal of A334709.