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 A216718 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). 6
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 3,3 REFERENCES Wayne M. Dymacek, Isaac Lambert and Kyle Parsons, Arithmetic Progressions in Permutations, http://math.ku.edu/~ilambert/CN.pdf, 2012. LINKS EXAMPLE Triangle begins: 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 ... CROSSREFS Cf. A216716, A216717, A165961, A180187. Sequence in context: A222061 A064315 A227322 * A184180 A256069 A267480 Adjacent sequences:  A216715 A216716 A216717 * A216719 A216720 A216721 KEYWORD nonn,tabf AUTHOR N. J. A. Sloane, Sep 15 2012 STATUS approved

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Last modified September 17 06:52 EDT 2019. Contains 327119 sequences. (Running on oeis4.)