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

Author

Lily Yen, Aug 09 2011

Keywords

• nonn
• more

Comments

Also the number of 4-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

Cf. A193938, A193936, A193937.