%I #5 Dec 18 2015 18:17:39
%S 1,1,1,2,5,20,86,486,3495,31938,368832,5412981,100924470,2390092072,
%T 71686035608,2726514241955,131508854502755,8039052200861454,
%U 622678408143680652
%N Half the number of n X n symmetric binary matrices with no element unequal to a strict majority of its king-move neighbors
%e Some solutions for n=5 with a(1,1)=0
%e ..0..0..1..1..1....0..0..0..1..1....0..0..0..1..1....0..0..0..0..0
%e ..0..0..1..1..1....0..0..0..1..1....0..0..0..1..1....0..0..0..0..0
%e ..1..1..0..0..0....0..0..1..1..1....0..0..0..1..1....0..0..0..0..0
%e ..1..1..0..0..0....1..1..1..1..1....1..1..1..0..0....0..0..0..0..0
%e ..1..1..0..0..0....1..1..1..1..1....1..1..1..0..0....0..0..0..0..0
%K nonn
%O 1,4
%A _R. H. Hardin_ May 16 2011