0,4
N. J. A. Sloane, Illustration of first 8 generations
Cf. A151885-A151888, A139250, A139251, A147562, A079314.
Sequence in context: A154937 A037996 A002741 this_sequence A070681 A061189 A019220
Adjacent sequences: A151884 A151885 A151886 this_sequence A151888 A151889 A151890
nonn,more
N. J. A. Sloane (njas(AT)research.att.com), Jul 23 2009
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