|Journal of Integer Sequences, Vol. 18 (2015), Article 15.9.6|
Department of Mathematical Sciences
Fredonia, NY 14063
Department of Computer Science
University of Pennsylvania
Philadelphia, PA 19104
(Concerned with sequences
Received June 25 2015; revised versions received August 14 2015; August 19 2015. Published in Journal of Integer Sequences, August 20 2015.