1,1
Cf. A020589. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 25 2008]
Sequence in context: A137519 A045344 A087685 * A165439 A168033 A020591
Adjacent sequences: A020616 A020617 A020618 * A020620 A020621 A020622
nonn,fini,full
David W. Wilson (davidwwilson(AT)comcast.net)