Journal of Integer Sequences, Vol. 18 (2015), Article 15.9.4 |
Demin Zhang
Xinxiang
Henan
P. R. China
Abstract:
(Concerned with sequence
A000108.)
Received April 9 2014; revised versions received April 26 2014; February 4 2015; March 14 2015; July 29 2015; August 6 2015. Published in Journal of Integer Sequences, August 18 2015.