login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A216722 Triangle read by rows: number of circular permutations of [1..n] with k modular progressions of rise 1, distance 1 and length 3 (n >= 3, 0 <= k <= n). 4
1, 0, 0, 1, 5, 0, 0, 0, 1, 18, 5, 0, 0, 0, 1, 95, 18, 6, 0, 0, 0, 1, 600, 84, 28, 7, 0, 0, 0, 1, 4307, 568, 116, 40, 8, 0, 0, 0, 1, 35168, 4122, 810, 156, 54, 9, 0, 0, 0, 1, 321609, 33910, 5975, 1100, 205, 70, 10, 0, 0, 0, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,5

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..62.

EXAMPLE

Triangle begins:

1 0 0 1

5 0 0 0 1

18 5 0 0 0 1

95 18 6 0 0 0 1

600 84 28 7 0 0 0 1

4307 568 116 40 8 0 0 0 1

35168 4122 810 156 54 9 0 0 0 1

321609 33910 5975 1100 205 70 10 0 0 0 1

...

CROSSREFS

Cf. A216716, A216718, A216719, A165962, A216723.

Sequence in context: A090750 A324656 A229656 * A036297 A087935 A243829

Adjacent sequences:  A216719 A216720 A216721 * A216723 A216724 A216725

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 20 05:34 EDT 2019. Contains 321344 sequences. (Running on oeis4.)