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See A195500 for discussion and list of related sequences; see A195625 for Mathematica program.
Table of n, a(n) for n=1..18.
Cf. A195500, A195625, A195627.
Sequence in context: A003392 A133026 A100339 * A158247 A034314 A265459
Adjacent sequences: A195623 A195624 A195625 * A195627 A195628 A195629
Clark Kimberling, Sep 22 2011