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Table of n, a(n) for n=1..22.
Cf. A175566, A175568, A175580.
Sequence in context: A250151 A257381 A257267 * A031664 A234736 A236094
Adjacent sequences: A175578 A175579 A175580 * A175582 A175583 A175584
Zak Seidov, Jul 15 2010