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A210810
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Number of (n+1)X(n+1) 0..2 symmetric matrices containing all values 0..2 with every 2X2 subblock having one or three distinct values, and new values 0..2 introduced in lower triangle row major order
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0
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1, 6, 51, 652, 13625, 466058, 26123303, 2397815264, 360393055117, 88675989046142, 35717797661887219, 23549404183669259508
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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..1..0..1....0..1..0..2....0..0..1..0....0..1..1..1....0..0..1..0
..1..2..0..2....1..2..1..1....0..0..2..2....1..2..0..2....0..0..2..0
..0..0..1..2....0..1..0..2....1..2..1..0....1..0..1..2....1..2..1..1
..1..2..2..0....2..1..2..1....0..2..0..2....1..2..2..0....0..0..1..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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