1,2
Cf. A003920.
Sequence in context: A111425 A013100 A013061 this_sequence A012989 A058171 A009043
Adjacent sequences: A071299 A071300 A071301 this_sequence A071303 A071304 A071305
nonn
Ron Hardin (rhh(AT)cadence.com), Jun 11 2002
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