0,2
David Applegate and N. J. A. Sloane, The Gift Exchange Problem (arXiv:0907.0513, 2009)
Cf. A144512, A048775, A144511, A144662.
Sequence in context: A131759 A156120 A078868 this_sequence A032734 A083625 A035772
Adjacent sequences: A147981 A147982 A147983 this_sequence A147985 A147986 A147987
nonn
N. J. A. Sloane (njas(AT)research.att.com), May 13 2009
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