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A309504
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Number of cyclic permutations of length n avoiding the pattern 123.
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3
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1, 1, 2, 4, 10, 24, 68, 188, 586, 1722, 5492, 16924
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OFFSET
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1,3
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LINKS
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EXAMPLE
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For n=3, there are two such permutations, 231 and 312.
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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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