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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A217803 Number of alternating permutations on 2n+1 letters that avoid a certain pattern of length 4 (see Lewis, 2012, Appendix, for precise definition). 0
1, 2, 12, 108, 1202, 15234, 210696, 3102296, 47875884 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..8.

J. B. Lewis, Pattern Avoidance for Alternating Permutations and Reading Words of Tableaux, Ph. D. Dissertation, Department of Mathematics, MIT, 2012.

CROSSREFS

Cf. A181197, A217799-A217830.

Sequence in context: A265132 A080446 A301411 * A177409 A212273 A055897

Adjacent sequences:  A217800 A217801 A217802 * A217804 A217805 A217806

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Oct 12 2012

EXTENSIONS

a(6)-a(8) from Lars Blomberg, Jan 23 2018

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 July 19 22:14 EDT 2019. Contains 325168 sequences. (Running on oeis4.)