

A224255


Number of permutations w in S_n whose KazhdanLusztig polynomial evaluated at q=1 is less than or equal to 2; P_{id,w}(1) <= 2.


1




OFFSET

1,2


COMMENTS

This family of permutations is characterized by a finite set of patterns.


REFERENCES

S. Billey and T. Braden, Lower bounds for KazhdanLusztig polynomials from patterns, Transform. Groups 8 (2003), no. 4, 321332.


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CROSSREFS



KEYWORD

nonn,more


AUTHOR



STATUS

approved



