0,2
Cf. A042420.
Sequence in context: A123181 A074656 A135397 this_sequence A003742 A135195 A001509
Adjacent sequences: A042418 A042419 A042420 this_sequence A042422 A042423 A042424
nonn,cofr,easy
N. J. A. Sloane (njas(AT)research.att.com).
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