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%I #5 Mar 31 2012 12:35:07
%S 1,1,4,13,77,556,5859,83423,1659982,45479269,1727097809,90646136576,
%T 6583459833641,661303481127357,91895146207819652,17663776192483786871
%N Half the number of n X n symmetric binary matrices with each 1 adjacent to some 0 horizontally (and vertically) and each 0 adjacent to some 1 horizontally (and vertically).
%K nonn
%O 2,3
%A _R. H. Hardin_, Jun 17 2008
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