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A217799
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Number of alternating permutations on 2n+1 letters that avoid a certain pattern of length 4 (see Lewis, 2012, Appendix, for precise definition).
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32
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OFFSET
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0,2
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LINKS
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Table of n, a(n) for n=0..8.
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: A181914 A089624 A217804 * A123555 A219446 A215702
Adjacent sequences: A217796 A217797 A217798 * A217800 A217801 A217802
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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 12 2012
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EXTENSIONS
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a(6)-a(8) from Lars Blomberg, Jan 23 2018
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STATUS
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approved
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