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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
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.
LINKS
Sara Billey and Tom Braden, Lower bounds for Kazhdan-Lusztig polynomials from patterns, arXiv:math/0202252 [math.RT], 2002-2003; see also, Transform. Groups 8 (2003), no. 4, 321-332.
CROSSREFS
Cf. A224255.
Sequence in context: A095818 A369098 A264781 * A256195 A256196 A256197
KEYWORD
nonn,more
AUTHOR
Sara Billey, Apr 03 2013
STATUS
approved