A289589 Related to number of mesh patterns of length 2 that avoid the pattern 321.

1, 1, 1, 2, 5, 15, 48, 159, 538, 1850, 6446

Offset

1,4

Links

Table of n, a(n) for n=1..11.

Shishuo Fu, Guo-Niu Han, and Zhicong Lin, k-arrangements, statistics and patterns, arXiv:2005.06354 [math.CO], 2020. Mentions this sequence.

Murray Tannock, Equivalence classes of mesh patterns with a dominating pattern, MSc Thesis, Reykjavik Univ., May 2016. See Appendix B2.

Crossrefs

Sequence in context: A149926 A321467 A301994 * A071739 A268407 A261003

Adjacent sequences: A289586 A289587 A289588 * A289590 A289591 A289592

Keyword

nonn,more

Author

N. J. A. Sloane, Jul 08 2017

Status

approved