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These numbers may have more than one such representation.
Table of n, a(n) for n=1..73.
Colm Mulcahy, Additional Certainties
Cf. A000045, A135709.
Sequence in context: A190572 A182619 A210447 * A031951 A043610 A043695
Adjacent sequences: A135555 A135556 A135557 * A135559 A135560 A135561
Colm Mulcahy, Feb 23 2008, Mar 02 2008
More terms from N. J. A. Sloane, Mar 01 2008, corrected Mar 05 2008