0,3
Cf. A005773.
Sequence in context: A027969 A027971 A018028 this_sequence A101308 A018029 A099483
Adjacent sequences: A045991 A045992 A045993 this_sequence A045995 A045996 A045997
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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