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arxiv: 1811.08314 · v2 · pith:DMLVCINOnew · submitted 2018-11-20 · 🧮 math.CO

Counting Words Avoiding a Short Increasing Pattern and the Pattern 1k...2

classification 🧮 math.CO
keywords wordsavoiddots2patternpatternsalphabetavoidingcounting
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We find finite-state recurrences to enumerate the words on the alphabet $[n]^r$ which avoid the patterns 123 and $1k(k-1)\dots2$, and, separately, the words which avoid the patterns 1234 and $1k(k-1)\dots2$.

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