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A217830
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Number of permutations of length 3n with descent set {3, 6, ...} that avoid a certain pattern of length 4 or 5 (see Lewis, 2012, Appendix, for precise definition).
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32
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..6.
J. B. Lewis, Pattern Avoidance for Alternating Permutations and Reading Words of Tableaux, Ph. D. Dissertation, Department of Mathematics, MIT, 2012.
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CROSSREFS
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Cf. A181197, A217799-A217830.
Sequence in context: A237429 A177611 A051847 * A002115 A223498 A352465
Adjacent sequences: A217827 A217828 A217829 * A217831 A217832 A217833
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KEYWORD
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nonn,more
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AUTHOR
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N. J. A. Sloane, Oct 13 2012
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EXTENSIONS
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a(5)-a(6) from Lars Blomberg, Mar 09 2018
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STATUS
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approved
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