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A note on 2-distant noncrossing partitions and weighted Motzkin paths

Authors :
Gessel, Ira M.
Kim, Jang Soo
Source :
Discrete Math., (310) 3421-3425, 2010
Publication Year :
2010

Abstract

We prove a conjecture of Drake and Kim: the number of $2$-distant noncrossing partitions of $\{1,2,...,n\}$ is equal to the sum of weights of Motzkin paths of length $n$, where the weight of a Motzkin path is a product of certain fractions involving Fibonacci numbers. We provide two proofs of their conjecture: one uses continued fractions and the other is combinatorial.<br />Comment: 6 pages, 2 figures

Details

Database :
arXiv
Journal :
Discrete Math., (310) 3421-3425, 2010
Publication Type :
Report
Accession number :
edsarx.1003.5301
Document Type :
Working Paper