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A210831
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Number of (n+1) X (n+1) 0..3 symmetric matrices with every 2 X 2 subblock having two or three distinct values, and new values 0..3 introduced in lower triangle row major order.
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0
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4, 141, 25169, 16941289, 40820607681, 350983455561087, 10767951776455515799, 1178739099906082214413048, 460405515303453536692441783335, 641654973151502496777935760164666385
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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..2..3....0..1..1..1....0..1..2..1....0..0..1..0....0..1..2..2
..1..1..3..1....1..2..2..3....1..2..2..2....0..1..2..1....1..1..3..3
..2..3..0..0....1..2..0..3....2..2..1..0....1..2..2..3....2..3..3..0
..3..1..0..3....1..3..3..0....1..2..0..2....0..1..3..2....2..3..0..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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