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A216718
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Triangle read by rows: number of circular permutations of [1..n] with k progressions of rise 1, distance 1 and length 3 (n >= 3, k >= 0).
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6
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1, 1, 1, 5, 0, 1, 20, 3, 0, 1, 102, 14, 3, 0, 1, 627, 72, 17, 3, 0, 1, 4461, 468, 87, 20, 3, 0, 1, 36155, 3453, 582, 103, 23, 3, 0, 1, 328849, 28782, 4395, 704, 120, 26, 3, 0, 1, 3317272, 267831, 37257, 5435, 834, 138, 29, 3, 0, 1
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OFFSET
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2,4
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REFERENCES
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Wayne M. Dymacek, Isaac Lambert and Kyle Parsons, Arithmetic Progressions in Permutations, http://math.ku.edu/~ilambert/CN.pdf, 2012.
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LINKS
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EXAMPLE
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Triangle begins:
1;
1, 1; [this is row n=3]
5, 0, 1;
20, 3, 0, 1;
102, 14, 3, 0, 1;
627, 72, 17, 3, 0, 1;
4461, 468, 87, 20, 3, 0, 1;
36155, 3453, 582, 103, 23, 3, 0, 1;
328849, 28782, 4395, 704, 120, 26, 3, 0, 1;
3317272, 267831, 37257, 5435, 834, 138, 29, 3, 0, 1;
...
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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