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A279454
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Number of nonequivalent ways to place k>=0 points on an n X n square grid so that no more than 2 points are on a vertical or horizontal straight line.
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6
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OFFSET
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1,1
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COMMENTS
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Rotations and reflections of a placement are not counted. For numbers if they are to be counted, see A197458.
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LINKS
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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