login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A224287 Number of multiplicity free permutations in S_n, i.e., permutations whose Stanley symmetric function is multiplicity free. 2
1, 2, 6, 24, 120, 718, 4956, 38180, 319280, 2837959 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

This family is conjectured to be characterized by a finite set of patterns up to S_11.

LINKS

Table of n, a(n) for n=1..10.

S. Billey and B. Pawlowski, Permutation Patterns, Stanley symmetric functions and generalized Specht modules, arXiv:1304.7870 [math.CO], 2013.

CROSSREFS

Cf. A005802, A223905, A224318.

Sequence in context: A223905 A164872 A226437 * A248838 A052398 A047890

Adjacent sequences: A224284 A224285 A224286 * A224288 A224289 A224290

KEYWORD

nonn,more

AUTHOR

Sara Billey, Apr 04 2013

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 29 14:48 EST 2022. Contains 358431 sequences. (Running on oeis4.)