Geodesic
Catalan words avoiding pairs of length three patterns
Discrete mathematics & theoretical computer science, Permutation Patterns 2019, Tome 22 (2020-2021) no. 2.

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Catalan words are particular growth-restricted words counted by the eponymous integer sequence. In this article we consider Catalan words avoiding a pair of patterns of length 3, pursuing the recent initiating work of the first and last authors and of S. Kirgizov where (among other things) the enumeration of Catalan words avoiding a patterns of length 3 is completed. More precisely, we explore systematically the structural properties of the sets of words under consideration and give enumerating results by means of recursive decomposition, constructive bijections or bivariate generating functions with respect to the length and descent number. Some of the obtained enumerating sequences are known, and thus the corresponding results establish new combinatorial interpretations for them. 
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     title = {Catalan words avoiding pairs of length three patterns},
     journal = {Discrete mathematics & theoretical computer science},
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Baril, Jean-Luc; Khalil, Carine; Vajnovszki, Vincent. Catalan words avoiding pairs of length three patterns. Discrete mathematics & theoretical computer science, Permutation Patterns 2019, Tome 22 (2020-2021) no. 2. doi : 10.46298/dmtcs.6002. http://geodesic.mathdoc.fr/articles/10.46298/dmtcs.6002/

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