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A210929
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Number of n X n 0..3 symmetric matrices with every element equal to zero or two horizontal and vertical neighbors, and new values 0..3 introduced in lower triangle row major order
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0
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1, 3, 42, 2316, 320744, 106842320, 85415568160, 163885278844480, 754594332585922688, 8337847863812427968768, 221082535444417970063262208
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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=4
..0..0..1..3....0..1..0..1....0..1..0..2....0..1..2..3....0..1..3..0
..0..0..2..1....1..2..3..2....1..0..2..3....1..0..3..2....1..2..0..2
..1..2..0..2....0..3..0..0....0..2..0..2....2..3..2..3....3..0..2..1
..3..1..2..1....1..2..0..0....2..3..2..3....3..2..3..0....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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