Inversion sequences avoiding 021 and another pattern of length four
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2023-11-17
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We study the enumeration of inversion sequences that avoid pattern 021 and another pattern of length four. We determine the generating trees for all possible pattern pairs and compute the corresponding generating functions. We introduce the concept of d-regular generating trees and conjecture that for any 021-avoiding pattern τ , the generating tree T ({021, τ }) is d-regular for some integer d.
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Discrete Mathematics & Theoretical Computer Science
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D M T C S
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English