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See A195500 for discussion and list of related sequences; see A195568 for Mathematica program.
Table of n, a(n) for n=1..21.
Cf. A195500, A195568, A195570.
Sequence in context: A197753 A197934 A137654 * A118908 A153060 A139244
Adjacent sequences: A195566 A195567 A195568 * A195570 A195571 A195572
Clark Kimberling, Sep 21 2011