OFFSET
1,2
COMMENTS
Also the number of 6-noncrossing permutations.
LINKS
Sophie Burrill, Sergi Elizalde, Marni Mishna and Lily Yen, A generating tree approach to k-nonnesting partitions and permutations, arXiv preprint arXiv:1108.5615 [math.CO], 2011-2014.
S. Corteel, Crossings and alignments of permutations, Adv. Appl. Math 38 (2007) 149-163.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Lily Yen, Aug 09 2011
STATUS
approved