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A229405
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Number of n X n 0..3 arrays avoiding 11 horizontally, 22 vertically, 33 antidiagonally and 00 diagonally
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1
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=3
..0..0..1....3..2..1....2..2..3....2..2..1....0..2..0....3..0..0....1..2..3
..3..3..1....1..3..2....3..1..0....3..1..0....0..3..1....0..2..1....2..0..3
..0..2..0....2..2..0....3..3..3....1..2..0....1..3..1....1..3..2....3..0..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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