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

1,5

Links

Table of n, a(n) for n=1..18.

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.

Sequence in context: A042273 A179167 A259845 * A299047 A296256 A351510

Adjacent sequences: A037182 A037183 A037184 * A037186 A037187 A037188

Keyword

nonn,more

Author

N. J. A. Sloane.

Extensions

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

Status

approved