0,4
Cf. A000992.
Sequence in context: A058766 A127601 A030038 this_sequence A075853 A132045 A032143
Adjacent sequences: A030037 A030038 A030039 this_sequence A030041 A030042 A030043
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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