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A210815
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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 one or 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, 168, 22071, 4205467, 1371990855, 822477585796, 938225630752531, 2077579958754422544, 9041912808668087622556, 77978293195183315063183805, 1340161768266449394440151104678
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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..2..2....0..0..0..2....0..1..0..2....0..1..0..2....0..1..2..1
..1..1..2..0....0..1..0..0....1..0..0..2....1..0..0..0....1..1..2..2
..2..2..2..2....0..0..0..3....0..0..0..0....0..0..1..1....2..2..2..3
..2..0..2..3....2..0..3..0....2..2..0..3....2..0..1..3....1..2..3..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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