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Parameters in Inversion Sequences

  • Margaret Archibald EMAIL logo , Aubrey Blecher and Arnold Knopfmacher
Published/Copyright: June 15, 2023
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ABSTRACT

We study various combinatorial parameters in the set of inversion sequences of length n. First, we provide generating functions for 1-successions and then generalise this to p-successions. Thereafter we find the formulae for the total number of successions by extracting coefficients. We then do the same for runs of length r and the length of the ith run. Next, we derive a generating function for the number of inversions in inversion sequences themselves and show that inversion sequences with no inversions are counted by the Catalan numbers. Finally, viewing inversion sequences as bargraphs, we develop a generating function for their area.

2020 Mathematics Subject Classification: Primary 05A05; Secondary 05A15

(Communicated by Anatolij Dvurečenskij)


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Received: 2021-12-06
Accepted: 2022-08-24
Published Online: 2023-06-15

© 2023 Mathematical Institute Slovak Academy of Sciences

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