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Half the number of n X n binary matrices differing in at most two positions between adjacent rows and at most two positions between adjacent columns.
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%I #7 Jan 05 2013 08:40:29

%S 1,8,161,3771,65536,968434,13398995,190804729,2840301338

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

%K nonn

%O 1,2

%A _R. H. Hardin_, May 28 2008