|
%I #19 Jun 14 2020 09:42:23
%S 1,2,6,24,120,720,5034,40087,356942,3500551,37343168,428886219,
%T 5257753614,68306562647,934747457369,13404687958473,200554264435218,
%U 3118638648191005,50236367074036768,835860362285064716
%N 4-nonnesting permutations.
%C Also the number of 4-noncrossing permutations.
%H Sophie Burrill, Sergi Elizalde, Marni Mishna and Lily Yen, <a href="http://arxiv.org/abs/1108.5615">A generating tree approach to k-nonnesting partitions and permutations</a>, arXiv preprint arXiv:1108.5615 [math.CO], 2011-2014.
%H S. Corteel, <a href="http://dx.doi.org/10.1016/j.aam.2006.01.006">Crossings and alignments of permutations</a>, Adv. Appl. Math 38 (2007) 149-163.
%Y Cf. A193938, A193936, A193937.
%K nonn,more
%O 1,2
%A _Lily Yen_, Aug 09 2011
|
