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A258186
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a(n) is the maximal number of circles that can be enclosed by a closed chain of n circles; all circles' centers lie at coordinate points of the planar net 6.6.6.
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1
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 6, 6, 7, 7, 10, 10, 13
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OFFSET
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0,15
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COMMENTS
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Inspired by A257594, in which the centers of circles can be considered to be placed on coordinate points of the planar net 3.3.3.3.3.3. See illustrations in the links.
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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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