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A210857
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Number of (n+1)X(n+1) 0..2 symmetric matrices with every 2X2 subblock having two or three distinct values, and new values 0..2 introduced in lower triangle row major order
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1
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4, 94, 6400, 1265336, 726175112, 1209791788480, 5850732722422240, 82137354029529991584, 3347356112567824150084288, 395998823277275732737683780672, 135993026862887355613684481546308800
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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..1..0..0....0..1..1..2....0..1..1..1....0..0..2..2....0..1..0..1
..1..0..0..1....1..0..2..0....1..2..0..1....0..1..0..2....1..2..1..1
..0..0..2..2....1..2..2..2....1..0..2..0....2..0..0..2....0..1..0..2
..0..1..2..0....2..0..2..1....1..1..0..0....2..2..2..0....1..1..2..2
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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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