A037189 Number of ways of placing 4n points on 2n X 2n grid so no 3 are in a line (solutions with either 90-degree rotational symmetry or full symmetry).

0, 0, 3, 4, 6, 4, 13, 13, 7, 16, 8, 23, 36, 58, 92, 101, 172, 281, 337, 541, 746

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• nice
• more

Links

• 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.
• A. Flammenkamp, Solutions of the no-three-in-line problem (Incorrect table!)
• A. Flammenkamp, Solutions of the no-three-in-line problem

Crossrefs

Cf. A000769.

Extensions

More terms (from Flammenkamp) from N. J. A. Sloane, May 24 2005

Edited by N. J. A. Sloane, Aug 29 2008 at the suggestion of R. J. Mathar