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Half the number of n X n binary matrices differing in at most three positions between adjacent rows and at most three positions between adjacent columns.
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%I #4 Mar 31 2012 12:35:07

%S 1,8,256,23045,3499498,540106922,68719476736

%N Half the number of n X n binary matrices differing in at most three positions between adjacent rows and at most three positions between adjacent columns.

%K nonn

%O 1,2

%A _R. H. Hardin_, May 28 2008