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A099952
Number of Wilf classes in S_n.
21
1, 1, 1, 3, 16, 91, 595
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OFFSET
1,4
REFERENCES
Z. Stankova and J. West, A new class of Wilf-equivalent permutations, J. Algeb. Combin., 15 (2002), 271-290.
LINKS
Table of n, a(n) for n=1..7.
A. M. Baxter,
Algorithms for Permutation Statistics
, Ph. D. Dissertation, Rutgers University, May 2011.
A. M. Baxter and A. D. Jaggard,
Pattern avoidance by even permutations
, arXiv preprint arXiv:1106.3653, 2011
Zvezdelina Stankova-Frenkel and Julian West,
A new class of Wilf-equivalent permutations, arXiv:math/0103152. See Fig. 9.
CROSSREFS
Representatives for the three Wilf classes in S_4 are
A005802
,
A022558
,
A061552
. -
N. J. A. Sloane
, Mar 15 2015
Representatives for the 16 Wilf-equivalence patterns of length 5 are given in
A116485
,
A047889
, and
A256195
-
A256208
. -
N. J. A. Sloane
, Mar 19 2015
Sequence in context:
A344455
A009124
A067679
*
A305852
A221764
A371742
Adjacent sequences:
A099949
A099950
A099951
*
A099953
A099954
A099955
KEYWORD
nonn
,
more
AUTHOR
N. J. A. Sloane
, Nov 12 2004
STATUS
approved
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Last modified April 27 14:12 EDT 2024. Contains 372019 sequences. (Running on oeis4.)