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A193938 3-nonnesting permutations. 3
1, 2, 6, 24, 118, 675, 4333, 30464, 230615, 1856336, 15738672, 139509303, 1285276242, 12248071935, 120255584181, 1212503440774, 12519867688928, 132079067871313, 1420723274988736, 15554956521285848 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Also the number of 3-noncrossing permutations.

LINKS

Table of n, a(n) for n=1..20.

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

Cf. A193935, A193936, A193937.

Sequence in context: A224295 A263777 A088713 * A298432 A336072 A328501

Adjacent sequences:  A193935 A193936 A193937 * A193939 A193940 A193941

KEYWORD

nonn,more

AUTHOR

Lily Yen, Aug 09 2011

STATUS

approved

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Last modified June 20 10:13 EDT 2021. Contains 345162 sequences. (Running on oeis4.)