%I #2 Apr 19 2016 01:16:09
%S 4,328
%N Number of partitions into "bus routes" of n X n grid.
%C 1. One and only one route exists on all edges of G
%C 2. Terminals of two different routes don't meet on the same point
%Y Cf. A131709.
%K nonn,more,bref
%O 1,1
%A _Yasutoshi Kohmoto_, Feb 18 2008
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