Journal of Integer Sequences, Vol. 12 (2009), Article 09.6.8

On Recurrences of Fahr and Ringel Arising in Graph Theory

Michael D. Hirschhorn
Department of Pure Mathematics
School of Mathematics and Statistics
University of New South Wales
Sydney NSW 2052


We solve certain recurrences given by Fahr and Ringel, and confirm their conjecture that two sequences are identical.

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(Concerned with sequences A110122 A132262.)

Received September 3 2009; revised version received October 2 2009. Published in Journal of Integer Sequences, October 2 2009.

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