%I #4 Mar 31 2012 12:35:07
%S 1,8,256,32768,13213313,11522939359,14149679017875
%N Half the number of n X n binary matrices differing in at most four positions between adjacent rows and at most four positions between adjacent columns.
%K nonn
%O 1,2
%A _R. H. Hardin_, May 28 2008