0,5
Cf. A000992.
Sequence in context: A096080 A143658 A005230 this_sequence A077078 A077079 A079969
Adjacent sequences: A030034 A030035 A030036 this_sequence A030038 A030039 A030040
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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