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Table of n, a(n) for n=0..16.
Cf. A007425, A061201.
Sequence in context: A091548 A017769 A017716 * A210783 A221237 A059694
Adjacent sequences: A180362 A180363 A180364 * A180366 A180367 A180368
Andrew Lelechenko, Jan 19 2011
One more term (a(16)) and typo in crossrefs fixed by Andrew Lelechenko, Apr 13 2011