A194192 Number of ways to arrange 7 indistinguishable points on an n X n square grid so that no three points are collinear at any angle.

0, 0, 0, 204, 26700, 1073076, 15657764, 159413700, 1108580092, 6030207624, 26852315940, 104865006648, 354993232192, 1098793355508, 3109294280324

Offset: 1

Author

R. H. Hardin, Aug 18 2011

Keywords

• nonn

Comments

Column 7 of A194193.

Examples

			Some solutions for 4 X 4:
..0..0..1..1....1..0..1..0....0..0..1..0....0..0..0..1....1..0..1..0
..0..0..0..1....0..0..0..1....0..0..1..1....1..0..1..0....0..1..0..0
..1..1..0..0....0..1..0..1....1..1..0..0....1..0..1..0....0..1..0..1
..0..1..1..0....0..1..1..0....0..1..0..1....0..1..0..1....1..0..1..0