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A190658 Half the number of n X n symmetric binary matrices with no element unequal to a strict majority of its vertical, antidiagonal and horizontal neighbors 1

%I #6 Dec 18 2015 18:17:39

%S 1,1,3,8,38,252,2107,22478,331824,6625044,173531500,6026107049,

%T 280634679581,17440962165250,1440182982082321,158309818157320775,

%U 23213155114911168104,4535580909418217659991,1179764335891702406715256

%N Half the number of n X n symmetric binary matrices with no element unequal to a strict majority of its vertical, antidiagonal and horizontal neighbors

%H R. H. Hardin, <a href="/A190658/b190658.txt">Table of n, a(n) for n = 1..24</a>

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

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

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

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

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

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

%K nonn

%O 1,3

%A _R. H. Hardin_ May 16 2011

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Last modified February 27 04:33 EST 2024. Contains 370362 sequences. (Running on oeis4.)