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- W3039891489 abstract "Path pairs are a modification of parallelogram polyominoes that provide yet another combinatorial interpretation of the Catalan numbers. More generally, the number of path pairs of length $n$ and distance $delta$ corresponds to the $(n-1,delta-1)$ entry of Shapiro's so-called Catalan triangle. In this paper, we widen the notion of path pairs $(gamma_1,gamma_2)$ to the situation where $gamma_1$ and $gamma_2$ may have different lengths, and then enforce divisibility conditions on runs of vertical steps in $gamma_2$. This creates a two-parameter family of integer triangles that generalize the Catalan triangle and qualify as proper Riordan arrays for many choices of parameters. In particular, we use generalized path pairs to provide a new combinatorial interpretation for all entries in every proper Riordan array $mathcal{R}(d(t),h(t))$ of the form $d(t) = C_k(t)^i$, $h(t) = t kern+1pt C_k(t)^k$, where $1 leq i leq k$ and $C_k(t)$ is the generating function for some sequence of Fuss-Catalan numbers (some $k geq 2$). Closed formulas are then provided for the number of generalized path pairs across an even broader range of parameters, as well as for the number of weak path pairs with a fixed number of non-initial intersections." @default.
- W3039891489 created "2020-07-10" @default.
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- W3039891489 date "2020-07-03" @default.
- W3039891489 modified "2023-09-27" @default.
- W3039891489 title "Generalized Path Pairs and Fuss-Catalan Triangles" @default.
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