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A177475
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Avoiding the pattern 131'2.To avoid 131'2 means not to have four consecutive letters such that if the third letter is removed, then in the obtained 3 letter word the smallest letter is the first one, and the largest letter is the second one.
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3
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OFFSET
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1,2
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REFERENCES
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S. Kitaev, Introduction to partially ordered patterns, Discrete Applied Mathematics 155 (2007), 929-944.
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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Signy Olafsdottir (signy06(AT)ru.is), May 09 2010
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STATUS
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approved
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