This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A216724 Triangle read by rows: number of permutations of [1..n] with k modular progressions of rise 2, distance 1 and length 3 (n >= 3, k >= 0). 2
 3, 3, 24, 0, 100, 15, 0, 5, 594, 108, 18, 0, 4389, 504, 119, 21, 0, 7, 35744, 3520, 960, 64, 32, 0, 325395, 31077, 5238, 927, 207, 27, 0, 9, 3288600, 288300, 42050, 8800, 900, 100, 50, 0 (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 EXAMPLE Triangle begins: 3 3 24 0 100 15 0 5 594 108 18 0 4389 504 119 21 0 7 35744 3520 960 64 32 0 325395 31077 5238 927 207 27 0 9 3288600 288300 42050 8800 900 100 50 0 ... CROSSREFS Cf. A216716, A216718, A216719, A216722, A216725. Sequence in context: A255355 A201133 A036114 * A219909 A092864 A183894 Adjacent sequences:  A216721 A216722 A216723 * A216725 A216726 A216727 KEYWORD nonn,tabf AUTHOR N. J. A. Sloane, Sep 15 2012 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified October 14 08:54 EDT 2019. Contains 327995 sequences. (Running on oeis4.)