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Publicado en línea: 14 jul 2017
Páginas: 11 - 21
Recibido: 14 sept 2016
DOI: https://doi.org/10.1515/puma-2015-0019
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© 2017
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
We enumerate permutations avoiding 1243, 2134, and a third 4-letter pattern τ, a step toward the goal of enumerating avoiders for all triples of 4-letter patterns. The enumeration is already known for all but three patterns τ, which are treated in this paper.