1,2
Cf. A000292.
Sequence in context: A030441 A072033 A159766 this_sequence A025016 A094244 A075447
Adjacent sequences: A004158 A004159 A004160 this_sequence A004162 A004163 A004164
nonn,base
N. J. A. Sloane (njas(AT)research.att.com).
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