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A224316 Number of permutations w in S_n whose Kazhdan-Lusztig polynomial P_{id,w}(1) <= 3. 1
1, 2, 6, 24, 119, 654, 3622 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
This family of permutations is closed under taking patterns. It is conjectured to be characterized by a finite set of patterns by Billey and Weed.
REFERENCES
S. Billey and T. Braden, Lower bounds for Kazhdan-Lusztig polynomials from patterns} (with Tom Braden). Transform. Groups 8 (2003), no. 4, 321-332.
LINKS
CROSSREFS
Cf. A224255.
Sequence in context: A005394 A095818 A264781 * A256195 A256196 A256197
KEYWORD
nonn,more
AUTHOR
Sara Billey, Apr 03 2013
STATUS
approved

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Last modified December 2 23:17 EST 2023. Contains 367526 sequences. (Running on oeis4.)