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A177473 Avoiding the pattern 12'1'2.To avoid 12'1'2 means not to have four consecutive letters such that the first one is less than the fourth letter and the second letter is larger than the third one. 3
1, 2, 6, 18, 61, 272, 1410, 8048, 51550 (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: A123639 A228448 A346490 * A177471 A303117 A150052
KEYWORD
nonn,more
AUTHOR
Signy Olafsdottir (signy06(AT)ru.is), May 09 2010
STATUS
approved

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Last modified May 18 00:47 EDT 2024. Contains 372608 sequences. (Running on oeis4.)