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A037189
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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).
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2
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0, 0, 3, 4, 6, 4, 13, 13, 7, 16, 8, 23, 36, 58, 92, 101, 172, 281, 337, 541, 746
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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REFERENCES
| 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.
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LINKS
| A. Flammenkamp, Solutions of the no-three-in-line problem (Incorrect table!)
A. Flammenkamp, Solutions of the no-three-in-line problem
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CROSSREFS
| Cf. A000769.
Sequence in context: A023823 A139186 A047840 * A083342 A016655 A057757
Adjacent sequences: A037186 A037187 A037188 * A037190 A037191 A037192
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KEYWORD
| nonn,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms (from Flammenkamp) from N. J. A. Sloane (njas(AT)research.att.com), May 24 2005
Edited by N. J. A. Sloane (njas(AT)research.att.com), Aug 29 2008 at the suggestion of R. J. Mathar
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