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A037185
Number of ways of placing 2n points on n X n grid so no 3 are in a line (solutions with no symmetry).
1
0, 0, 0, 0, 3, 4, 11, 40, 41, 132, 122, 524, 407, 1284, 3681, 5683, 6800, 18853
OFFSET
1,5
LINKS
Benjamin Chaffin, 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
Sequence in context: A042273 A179167 A259845 * A299047 A296256 A351510
KEYWORD
nonn,more
AUTHOR
EXTENSIONS
a(17) and a(18) from Benjamin Chaffin, Apr 05 2006
STATUS
approved