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Merges with A064413 after 3 steps.
Table of n, a(n) for n=1..73.
A generalization of A064413.
Sequence in context: A257885 A257908 A097467 * A209877 A187109 A242599
Adjacent sequences: A169836 A169837 A169838 * A169840 A169841 A169842
T. D. Noe and N. J. A. Sloane, Jun 02 2010