Journal of Integer Sequences, Vol. 28 (2025), Article 25.5.7

Associated Stirling Eulerian Numbers and Their q-Analogues


Imboa-Navalona Manjaka Rakotoson and Fanja Rakotondrajao
Department of Mathematics and Computer Science
Antananarivo University
101 Antananarivo
Madagascar

Abstract:

In this paper, we study the excedance distribution over permutations while considering the parameters of cycle length and the number of cycles. We refer to the number of such permutations as the associated Stirling Eulerian number. Moreover, if we consider the permutations in which the first s integers are in different cycles, we denote their count as the associated s-Stirling Eulerian number. We provide a formula defining these numbers, along with their generating functions. We establish q-analogues and offer extensions of the results.


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Received September 26 2023; revised versions received April 17 2024; September 2 2024; August 11 2025. Published in Journal of Integer Sequences, September 21 2025.


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