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A183305
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Half the number of nX4 binary arrays with no element equal to a strict majority of its horizontal and vertical neighbors
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2
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2, 6, 19, 55, 178, 572, 1798, 5700, 18064, 57249, 181433, 574924, 1821857, 5773450, 18295845, 57978643, 183731482, 582236576, 1845081304, 5846978390, 18528805856, 58716935815, 186071279593, 589651361292, 1868578146701, 5921438527588
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n)=5*a(n-1)-6*a(n-2)+a(n-3)+a(n-4)-9*a(n-5)+4*a(n-6)+a(n-7)+28*a(n-8)-16*a(n-9)-3*a(n-10)+2*a(n-11)-6*a(n-12)+2*a(n-13)-a(n-14) for n>15
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EXAMPLE
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Some solutions with a(1,1)=0 for 4X4
..0..1..0..1....0..1..1..0....0..0..1..0....0..1..0..0....0..1..0..1
..1..0..1..0....1..0..0..1....1..1..0..1....1..0..1..1....0..1..1..0
..0..1..1..0....0..0..1..0....0..1..1..0....0..0..1..0....1..0..1..1
..0..1..0..1....1..1..0..1....1..0..0..1....1..1..0..1....0..1..0..0
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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