0,2
Cf. A042640.
Sequence in context: A119110 A041305 A144535 this_sequence A042285 A041070 A065938
Adjacent sequences: A042638 A042639 A042640 this_sequence A042642 A042643 A042644
nonn,cofr,easy
N. J. A. Sloane (njas(AT)research.att.com).
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