A037186 Number of ways of placing 2n points on n X n grid so no 3 are in a line (solutions with symmetry about one main diagonal).

0, 0, 0, 0, 2, 0, 1, 5, 3, 3, 6, 3, 9, 5, 13, 14, 12, 14, 16, 17, 13, 18, 34, 43, 55

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• more

Links

• 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.