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A187402
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Number of (n+1)X(n+1) 0..2 arrays with diagonal zero and the i,j-th 2X2 subblock sum equal to the j,i-th 2X2 subblock sum
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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 4X4
..0..0..2..1....0..2..0..0....0..2..0..1....0..2..0..2....0..2..0..2
..2..0..2..0....1..0..0..2....2..0..2..0....2..0..1..1....2..0..2..0
..0..2..0..2....0..1..0..1....2..0..0..0....0..1..0..1....0..2..0..1
..2..1..1..0....1..0..2..0....1..0..2..0....2..1..1..0....2..0..1..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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