A193935 4-nonnesting permutations.
1, 2, 6, 24, 120, 720, 5034, 40087, 356942, 3500551, 37343168, 428886219, 5257753614, 68306562647, 934747457369, 13404687958473, 200554264435218, 3118638648191005, 50236367074036768, 835860362285064716
Offset: 1
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.
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