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A210836
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Number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having one, three 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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1,1
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LINKS
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EXAMPLE
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Some solutions for n=3
..0..0..1..3....0..1..3..2....0..1..2..1....0..1..2..2....0..1..3..0
..0..0..2..2....1..2..0..3....1..2..0..3....1..2..0..3....1..2..3..1
..1..2..1..3....3..0..1..0....2..0..1..1....2..0..3..1....3..3..0..0
..3..2..3..0....2..3..0..3....1..3..1..1....2..3..1..2....0..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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