Geodesic
Permutations avoiding 4321 and 3241 have an algebraic generating function
Discrete mathematics & theoretical computer science, Permutation Patterns 2019, Tome 22 (2020-2021) no. 2.

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We show that permutations avoiding both of the (classical) patterns 4321 and 3241 have the algebraic generating function conjectured by Vladimir Kruchinin.
DOI : 10.46298/dmtcs.5286
Classification : 05A05, 05A15 
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Callan, David. Permutations avoiding 4321 and 3241 have an algebraic generating function. Discrete mathematics & theoretical computer science, Permutation Patterns 2019, Tome 22 (2020-2021) no. 2. doi : 10.46298/dmtcs.5286. http://geodesic.mathdoc.fr/articles/10.46298/dmtcs.5286/

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