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A210855
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Number of (n+1)X(n+1) 0..2 symmetric matrices with every 2X2 subblock having one or two distinct values, and new values 0..2 introduced in lower triangle row major order
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1
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4, 46, 1139, 55516, 5327304, 1010944060, 380704421087, 285205710360936, 425825333933157003, 1268871858354238286927, 7554384371145384136117854, 89942576436863983961350601461, 2143078341798100623746679385130235
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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..1..0....0..1..2..2....0..1..1..1....0..0..0..0....0..1..0..0
..1..0..1..1....1..1..1..1....1..1..2..1....0..0..0..0....1..1..1..1
..1..1..1..0....2..1..2..2....1..2..2..2....0..0..0..0....0..1..1..0
..0..1..0..0....2..1..2..0....1..1..2..2....0..0..0..1....0..1..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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