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Half the number of n X n symmetric binary matrices with adjacent rows differing in at most four positions.
0

%I #4 Mar 31 2012 12:35:07

%S 1,4,32,512,14513,603485,29856303,1487335683,68719476736,2898212537994

%N Half the number of n X n symmetric binary matrices with adjacent rows differing in at most four positions.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jun 15 2008