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A224255
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Number of permutations w in S_n whose Kazhdan-Lusztig polynomial evaluated at q=1 is less than or equal to 2; P_{id,w}(1) <= 2.
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1
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OFFSET
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1,2
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COMMENTS
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This family of permutations is characterized by a finite set of patterns.
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REFERENCES
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S. Billey and T. Braden, Lower bounds for Kazhdan-Lusztig polynomials from patterns, Transform. Groups 8 (2003), no. 4, 321-332.
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LINKS
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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