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.
FindStat - Combinatorial Statistic Finder, The evaluation of the Kazhdan-Lusztig polynomial P(id,w) for each permutation w in S_n evaluated at q = 1
A. Woo, Permutations with Kazhdan-Lusztig polynomial P_{id,w}(q) = 1 + q^h with appendix by Sara Billey and Jonathan Weed, The Electronic Journal of Combinatorics, Volume 16(2), 2009.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Sara Billey, Apr 03 2013
STATUS
approved