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 A216716 Triangle read by rows: number of permutations of [1..n] with k progressions of rise 2, distance 1 and length 3 (n >= 1, k >= 0). 6
 1, 2, 6, 24, 114, 6, 674, 44, 2, 4714, 294, 30, 2, 37754, 2272, 276, 16, 2, 340404, 20006, 2236, 216, 16, 2, 3412176, 193896, 20354, 2200, 156, 16, 2, 37631268, 2056012, 206696, 20738, 1908, 160, 16, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS K. J. Parsons, Arithmetic progressions in permutations, Thesis, Washington and Lee University, 2011 Wayne M. Dymacek, Isaac Lambert and Kyle Parsons, Arithmetic Progressions in Permutations, 2012. EXAMPLE Triangle begins: 1 2 6 [this is for n=3] 24 114 6 674 44 2 4714 294 30 2 37754 2272 276 16 2 340404 20006 2236 216 16 2 3412176 193896 20354 2200 156 16 2 37631268 2056012 206696 20738 1908 160 16 2 ... CROSSREFS Cf. A216717. Sequence in context: A152328 A152325 A152329 * A192088 A245233 A228907 Adjacent sequences:  A216713 A216714 A216715 * A216717 A216718 A216719 KEYWORD nonn,tabf AUTHOR N. J. A. Sloane, Sep 15 2012 STATUS approved

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Last modified September 15 18:22 EDT 2019. Contains 327082 sequences. (Running on oeis4.)