Sequences from Fibonacci to Catalan: A combinatorial interpretation via Dyck paths

We use Dyck paths having some restrictions in order to give a combinatorial interpretation for some famous number sequences. Starting from the Fibonacci numbers we show how the k -generalized Fibonacci numbers, the powers of 2, the Pell numbers, the k -generalized Pell numbers and the even-indexed F...

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Published inRAIRO. Informatique théorique et applications Vol. 58; p. 8
Main Authors Barcucci, Elena, Bernini, Antonio, Pinzani, Renzo
Format Journal Article
LanguageEnglish
Published 2024
Online AccessGet full text
ISSN0988-3754
2804-7346
DOI10.1051/ita/2024007

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Abstract We use Dyck paths having some restrictions in order to give a combinatorial interpretation for some famous number sequences. Starting from the Fibonacci numbers we show how the k -generalized Fibonacci numbers, the powers of 2, the Pell numbers, the k -generalized Pell numbers and the even-indexed Fibonacci numbers can be obtained by means of constraints on the number of consecutive valleys (at a given height) of the Dyck paths. By acting on the maximum height of the paths we get a succession of number sequences whose limit is the sequence of Catalan numbers. For these numbers we obtain a family of interesting relations including a full history recurrence relation. The whole study can be accomplished also by involving particular sets of strings via a simple encoding of Dyck paths.
AbstractList We use Dyck paths having some restrictions in order to give a combinatorial interpretation for some famous number sequences. Starting from the Fibonacci numbers we show how the k -generalized Fibonacci numbers, the powers of 2, the Pell numbers, the k -generalized Pell numbers and the even-indexed Fibonacci numbers can be obtained by means of constraints on the number of consecutive valleys (at a given height) of the Dyck paths. By acting on the maximum height of the paths we get a succession of number sequences whose limit is the sequence of Catalan numbers. For these numbers we obtain a family of interesting relations including a full history recurrence relation. The whole study can be accomplished also by involving particular sets of strings via a simple encoding of Dyck paths.
Author Bernini, Antonio
Barcucci, Elena
Pinzani, Renzo
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