A037185 Number of ways of placing 2n points on n X n grid so no 3 are in a line (solutions with no symmetry).

0, 0, 0, 0, 3, 4, 11, 40, 41, 132, 122, 524, 407, 1284, 3681, 5683, 6800, 18853

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• more

Links

• Benjamin Chaffin, No-Three-In-Line Problem.
• A. Flammenkamp, Solutions of the no-three-in-line problem
• A. Flammenkamp, Solutions of the no-three-in-line problem
• A. Flammenkamp, Progress in the no-three-in-line problem, J. Combinat. Theory A 60 (1992), 305-311.
• A. Flammenkamp, Progress in the no-three-in-line problem. II, J. Combin. Theory Ser. A 81 (1998), no. 1, 108-113.

Crossrefs

Cf. A000769, A000755.

Extensions

a(17) and a(18) from Benjamin Chaffin, Apr 05 2006