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A037188
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Number of ways of placing 2n points on n X n grid so no 3 are in a line (solutions with symmetry about both main diagonals).
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1
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0, 0, 1, 1, 0, 2, 0, 0, 0, 1, 0, 2, 1, 3, 1, 1, 0, 2, 0, 2, 0, 1, 1, 2, 2, 0, 0, 0, 1, 1, 2, 1, 0, 0, 1, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0
(list;
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listen;
history;
text;
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OFFSET
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1,6
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LINKS
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Table of n, a(n) for n=1..45.
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.
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CROSSREFS
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Cf. A000769.
Sequence in context: A056674 A336107 A227761 * A276847 A271231 A306798
Adjacent sequences: A037185 A037186 A037187 * A037189 A037190 A037191
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KEYWORD
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nonn,more
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AUTHOR
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N. J. A. Sloane.
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EXTENSIONS
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More terms from Flammenkamp web site, May 24 2005
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STATUS
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approved
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