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%I #4 Jan 30 2017 21:26:09
%S 1,2431,4061871,7528988476,15467641899285,34155922905682979,
%T 79397199549271412737,191739533381111401455478,
%U 476872353039366288373555323
%N Column 5 of A144512.
%H Moa Apagodu, David Applegate, N. J. A. Sloane, and Doron Zeilberger, <a href="http://arxiv.org/abs/1701.08394">Analysis of the Gift Exchange Problem</a>, arXiv:1701.08394, 2017.
%H David Applegate and N. J. A. Sloane, <a href="http://arxiv.org/abs/0907.0513">The Gift Exchange Problem</a> (arXiv:0907.0513, 2009)
%Y Cf. A144512, A048775, A144511, A144662.
%K nonn
%O 0,2
%A _N. J. A. Sloane_, May 13 2009