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A099952 Number of Wilf classes in S_n. 19
1, 1, 1, 3, 16, 91, 595 (list; graph; refs; listen; history; text; internal format)
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: A130744 A009124 A067679 * A305852 A221764 A213229

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 July 15 14:33 EDT 2019. Contains 325031 sequences. (Running on oeis4.)