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The Deranged Bell Numbers

  • Hacène Belbachir , Yahia Djemmada EMAIL logo and László Németh
Published/Copyright: August 4, 2023
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ABSTRACT

Based on the combinatorial interpretation of the ordered Bell numbers, which count all the ordered partitions of the set [n] = {1, 2, … n}, this paper introduces the deranged partition as a free-fixed-block permutation of its blocks, then defines the deranged Bell numbers that count the total number of the deranged partitions of [n].

At first, we study the classical properties of these numbers (generating function, explicit formula, convolutions, etc.), we then present an asymptotic behavior of the deranged Bell numbers. Finally, we briefly review some results regarding the r-extension of these numbers by considering that the r first elements must be in distinct blocks.

2020 Mathematics Subject Classification: Primary 11B73; 05A18; Secondary 05A05

(Communicated by Marco Cantarini)


Funding statement: For H. Belbachir and Y. Djemmada, the paper was partially supported by the DGRSDT grant C0656701.

Acknowledgement

We would like to thank the anonymous reviewers for their suggestions and comments which improved the quality of the present paper.

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Received: 2022-02-16
Accepted: 2022-09-26
Published Online: 2023-08-04

© 2023 Mathematical Institute Slovak Academy of Sciences

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