1,1

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

nonn

Colm Mulcahy, Feb 23 2008, Mar 02 2008

More terms from N. J. A. Sloane, Mar 01 2008, corrected Mar 05 2008

approved