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Half the number of n X n symmetric binary matrices with no element unequal to a strict majority of its king- and knight-move neighbors
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%I #5 Dec 18 2015 18:17:39

%S 1,1,1,3,3,8,20,53,141,552,2419,12788,78700,561036,4750312

%N Half the number of n X n symmetric binary matrices with no element unequal to a strict majority of its king- and knight-move neighbors

%e All solutions for n=5 with a(1,1)=0

%e ..0..0..0..0..0....0..0..0..1..1....0..0..1..1..1

%e ..0..0..0..0..0....0..0..0..1..1....0..0..1..1..1

%e ..0..0..0..0..0....0..0..0..1..1....1..1..0..0..0

%e ..0..0..0..0..0....1..1..1..0..0....1..1..0..0..0

%e ..0..0..0..0..0....1..1..1..0..0....1..1..0..0..0

%K nonn

%O 1,4

%A _R. H. Hardin_ May 16 2011