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A078673
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Number of ways of arranging the numbers 1..n in a circle so that there is no consecutive triple i, i+1, i+2 or i, i-1, i-2 (mod n).
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8
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OFFSET
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1,4
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COMMENTS
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Arrangement that differ only in the direction in which the cycle is traversed do not count as different.
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LINKS
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CROSSREFS
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Apart from initial terms, A078628/2.
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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