1,3
J. H. Conway, personal communication.
N. J. A. Sloane, Classic Sequences
Cf. A019588.
Sequence in context: A077819 A030313 A113977 this_sequence A102427 A080883 A021315
Adjacent sequences: A019584 A019585 A019586 this_sequence A019588 A019589 A019590
nonn,easy,nice
njas and J. H. Conway (conway(AT)math.princeton.edu)
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