0,2
Cf. A054540.
Sequence in context: A054540 A117537 A137713 this_sequence A048818 A062713 A086108
Adjacent sequences: A018062 A018063 A018064 this_sequence A018066 A018067 A018068
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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