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A223005
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Number of n X n 0..1 arrays with no more than floor(n X n/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..1 order
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0
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1, 4, 24, 840, 35471, 8156595, 2073830655, 2804191942757, 4149994855051281, 32191007835248846536, 272625366029849993313502, 11994700692484110855119938470
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=3
..0..0..0....0..0..0....0..1..1....0..0..0....0..0..0....0..0..0....0..0..1
..0..0..0....0..0..0....1..1..1....0..0..1....1..1..1....0..0..0....1..0..0
..0..0..0....1..0..0....1..1..1....0..0..0....1..1..1....0..1..0....0..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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