0,2
Cf. A000521.
Sequence in context: A031575 A031755 A133598 this_sequence A032658 A157666 A028546
Adjacent sequences: A028514 A028515 A028516 this_sequence A028518 A028519 A028520
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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