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A209683
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Number of n X n 0..8 arrays with every element equal to a diagonal or antidiagonal reflection, and new values 0 upwards introduced in row major order
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1
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1, 15, 1551, 14164693, 847881355388, 5219870359015849505, 70570762532647014868797563, 62256944108221643391817947390337742, 103256072887229091159525820942838733556042886
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OFFSET
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1,2
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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..1..0....0..1..2....0..1..1....0..1..1....0..1..2....0..1..0....0..1..1
..2..1..1....3..3..1....1..2..0....2..2..1....1..3..3....1..2..2....0..1..1
..2..2..0....3..3..1....1..0..1....2..2..0....2..3..0....3..2..0....0..0..0
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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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