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A216719 Triangle read by rows: number of circular permutations of [1..n] with k progressions of rise 1, distance 2 and length 3 (n >= 3, k >= 0). 5
2, 6, 22, 2, 109, 10, 1, 657, 55, 7, 1, 4625, 356, 54, 4, 1, 37186, 2723, 362, 44, 4, 1, 336336, 23300, 2837, 368, 34, 4, 1, 3379058, 220997, 25408, 2967, 330, 35, 4, 1, 37328103, 2308564, 249736, 26964, 3100, 292, 36, 4, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,1

REFERENCES

Wayne M. Dymacek, Isaac Lambert and Kyle Parsons, Arithmetic Progressions in Permutations, http://math.ku.edu/~ilambert/CN.pdf, 2012.

LINKS

Table of n, a(n) for n=3..48.

EXAMPLE

Triangle begins:

2

6

22 2

109 10 1

657 55 7 1

4625 356 54 4 1

37186 2723 362 44 4 1

336336 23300 2837 368 34 4 1

3379058 220997 25408 2967 330 35 4 1

37328103 2308564 249736 26964 3100 292 36 4 1

...

CROSSREFS

Cf. A216716, A216718, A216720, A216721.

Sequence in context: A216964 A187250 A129534 * A085286 A062085 A284632

Adjacent sequences:  A216716 A216717 A216718 * A216720 A216721 A216722

KEYWORD

nonn,tabf

AUTHOR

N. J. A. Sloane, Sep 15 2012

STATUS

approved

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Last modified September 15 16:12 EDT 2019. Contains 327078 sequences. (Running on oeis4.)