Counting independent sets in Riordan graphs

Gi-Sang Cheon, Ji-Hwan Jung, Bumtle Kang, Hana Kim, Suh-Ryung Kim, Sergey Kitaev, Seyed Ahmad Mojallal

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)
17 Downloads (Pure)


The notion of a Riordan graph was introduced recently, and it is a far-reaching generalization of the well-known Pascal graphs and Toeplitz graphs. However, apart from a certain subclass of Toeplitz graphs, nothing was known on independent sets in Riordan graphs.

In this paper, we give exact enumeration and lower and upper bounds
for the number of independent sets for various classes of Riordan
graphs. Remarkably, we offer a variety of methods to solve the
problems that range from the structural decomposition theorem to
methods in combinatorics on words. Some of our results are valid for
any graph.
Original languageEnglish
Article number112043
Number of pages20
JournalDiscrete Mathematics
Issue number11
Early online date3 Jul 2020
Publication statusPublished - 30 Nov 2020


  • Riordan graph
  • Toeplitz graph
  • independent set
  • pattern avoiding sequence
  • Fibonacci number
  • Pell number
  • Hamiltonian path


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