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A229373
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Number of n X n 0..2 arrays avoiding 11 horizontally, 22 vertically and 00 diagonally or antidiagonally.
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1
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3, 30, 956, 78690, 20014278, 13999334726, 29757371834046, 174511010613631514, 3123774881474924676470, 153541601581149110702908096, 23150533101205838897343355257558, 9547382122506738591063952302014235288
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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=4
..1..0..1..0....2..0..0..2....2..0..2..1....1..2..2..1....1..2..1..2
..1..0..1..0....1..2..2..1....1..0..1..2....2..0..1..0....0..0..0..0
..2..0..1..2....1..0..1..2....1..0..1..0....1..0..2..0....2..1..2..1
..1..2..2..1....1..2..1..0....2..0..1..2....1..0..1..2....0..0..0..2
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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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