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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A223905 Number of 4-vexillary permutations in S_n, that is, permutations whose Stanley symmetric function has at most 4 terms or at most 4 Edelman-Greene tableaux. 4
1, 1, 2, 6, 24, 120, 717, 4824, 34629, 256689, 1935301 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

This family is characterized by a finite set of patterns.

REFERENCES

S. Billey and B. Pawlowski, Permutation Patterns, Stanley symmetric functions and generalized Specht modules, preprint 2013.

LINKS

Table of n, a(n) for n=0..10.

Elizabeth Hartung, Hung Phuc Hoang, Torsten M├╝tze, Aaron Williams, Combinatorial generation via permutation languages, arXiv:1906.06069 [cs.DM], 2019.

CROSSREFS

Cf. A005802, A224318.

Sequence in context: A121987 A324132 A177524 * A164872 A226437 A224287

Adjacent sequences:  A223902 A223903 A223904 * A223906 A223907 A223908

KEYWORD

nonn,more

AUTHOR

Sara Billey, Apr 04 2013

EXTENSIONS

a(0)=1 prepended by Alois P. Heinz, Jul 31 2019

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 September 20 18:52 EDT 2019. Contains 327245 sequences. (Running on oeis4.)