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A235939
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Number of circular permutations with exactly one (unspecified) increasing or decreasing modular 3-sequence, with clockwise and counterclockwise traversals not counted as distinct.
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6
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0, 0, 0, 0, 5, 12, 77, 496, 3672, 30560, 284031, 2913624, 32724939, 399561428, 5270747880, 74717040128, 1132896574609, 18297399806532, 313634823814769, 5686864630734840, 108757303793301240
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OFFSET
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1,5
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COMMENTS
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Arrangements that differ only in the direction in which the cycle is traversed do not count as different.
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REFERENCES
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Paul J. Campbell, Circular permutations with exactly one modular run (3-sequence), submitted to Journal of Integer Sequences
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LINKS
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FORMULA
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EXAMPLE
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a(5) = 5: 12354, 23415, 34521, 45132, 51243.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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