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A233920
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Number of (n+1)X(n+1) 0..4 arrays with every 2X2 subblock having the sum of the absolute values of the edge differences equal to 8 and no adjacent elements equal
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0
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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 n=2
..0..1..3....1..0..2....4..1..0....2..4..2....0..3..0....0..3..0....4..3..1
..3..0..4....4..3..4....3..4..1....0..2..0....1..4..3....2..4..2....1..0..2
..4..1..2....1..0..3....4..1..0....3..4..2....3..2..0....3..1..3....4..2..4
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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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