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A185833
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Half the number of nX7 binary arrays with every element equal to exactly one or two of its horizontal and vertical neighbors
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1
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8, 421, 5004, 54223, 649826, 7678409, 91052720, 1073661088, 12644950311, 149729950026, 1765937206744, 20858521172073, 246298874943372, 2908556504972388, 34344854423802299, 405576876056939440
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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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EXAMPLE
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Some solutions for 4X7 with a(1,1)=0
..0..1..1..1..0..0..0....0..1..1..0..1..0..0....0..1..0..0..0..1..0
..0..0..0..0..1..1..1....0..1..0..0..1..1..0....0..1..1..1..0..1..0
..1..1..1..0..1..0..1....1..0..0..1..0..1..0....1..0..0..0..0..1..0
..0..0..1..0..1..0..1....1..1..1..1..0..1..1....1..0..1..1..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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