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A177472 Avoiding the pattern 11'2'2.To avoid 11'2'2 means not to have four consecutive letters such that the first letter is less than the last one and the second letter is less than the third one. 3
1, 2, 6, 18, 71, 322, 1665, 9789, 64327 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
S. Kitaev, Introduction to partially ordered patterns, Discrete Applied Mathematics 155 (2007), 929-944.
CROSSREFS
Sequence in context: A131281 A264036 A261994 * A364849 A194088 A022491
KEYWORD
nonn,more
AUTHOR
Signy Olafsdottir (signy06(AT)ru.is), May 09 2010
STATUS
approved

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Last modified May 22 09:19 EDT 2024. Contains 372745 sequences. (Running on oeis4.)