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- W2962862310 abstract "The Catalan number Cn enumerates parenthesizations of x0∗⋯∗xn where ∗ is a binary operation. We introduce the modular Catalan number Ck,n to count equivalence classes of parenthesizations of x0∗⋯∗xn when ∗ satisfies a k-associative law generalizing the usual associativity. This leads to a study of restricted families of Catalan objects enumerated by Ck,n with emphasis on binary trees, plane trees, and Dyck paths, each avoiding certain patterns. We give closed formulas for Ck,n with two different proofs. For each n≥0 we compute the largest size of k-associative equivalence classes and show that the number of classes with this size is a Catalan number." @default.
- W2962862310 created "2019-07-30" @default.
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- W2962862310 date "2017-03-01" @default.
- W2962862310 modified "2023-09-27" @default.
- W2962862310 title "Modular Catalan numbers" @default.
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- W2962862310 doi "https://doi.org/10.1016/j.ejc.2016.11.004" @default.
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