0,2
Cf. A000521.
Sequence in context: A030645 A010463 A035857 this_sequence A057698 A106763 A091362
Adjacent sequences: A028510 A028511 A028512 this_sequence A028514 A028515 A028516
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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