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

 

Logo


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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 21 11:18 EDT 2019. Contains 327253 sequences. (Running on oeis4.)