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A210821
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Number of (n+1)X(n+1) 0..3 symmetric matrices containing all values 0..3 with every 2X2 subblock having one, two or four distinct values, and new values 0..3 introduced in lower triangle row major order
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0
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OFFSET
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1,2
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LINKS
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EXAMPLE
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Some solutions for n=3
..0..0..2..3....0..0..2..2....0..1..0..0....0..1..2..3....0..1..2..1
..0..1..3..2....0..1..3..3....1..1..1..0....1..0..3..2....1..0..3..0
..2..3..3..3....2..3..1..1....0..1..2..3....2..3..3..2....2..3..0..0
..3..2..3..1....2..3..1..2....0..0..3..2....3..2..2..2....1..0..0..1
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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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