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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.
2
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
1,3
COMMENTS
Computed by Tom Duff, Jun 15 2020 - Jun 22 2020
CROSSREFS
The main diagonal of A334709.
Sequence in context: A222688 A254927 A221466 * A067360 A221770 A007060
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jun 15 2020
STATUS
approved