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A210814
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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 two distinct values, and new values 0..3 introduced in lower triangle row major order
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0
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0, 1, 100, 6684, 599536, 82309141, 18679289180, 7191882371599, 4794826023217991, 5595844097524199026, 11523237615776387849625, 42103142637653897079485507
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OFFSET
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1,3
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LINKS
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EXAMPLE
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Some solutions for n=3
..0..1..0..2....0..1..0..1....0..0..0..0....0..1..1..2....0..1..2..0
..1..1..0..0....1..0..0..0....0..1..0..2....1..1..2..1....1..1..2..2
..0..0..0..3....0..0..2..2....0..0..0..0....1..2..2..2....2..2..1..1
..2..0..3..3....1..0..2..3....0..2..0..3....2..1..2..3....0..2..1..3
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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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