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A217830 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). 32
1, 19, 1513, 211425, 40607753, 9694117094 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
J. B. Lewis, Pattern Avoidance for Alternating Permutations and Reading Words of Tableaux, Ph. D. Dissertation, Department of Mathematics, MIT, 2012.
CROSSREFS
Sequence in context: A237429 A177611 A051847 * A002115 A223498 A352465
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Oct 13 2012
EXTENSIONS
a(5)-a(6) from Lars Blomberg, Mar 09 2018
STATUS
approved

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Last modified March 18 22:56 EDT 2024. Contains 370952 sequences. (Running on oeis4.)