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A209585
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Number of n X n 0..n arrays with every element equal to a diagonal or antidiagonal reflection
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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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FORMULA
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a(n) = (n+1) ^ (2n-(n modulo 2)) * ((n+1)*(2n+1)) ^ ((n*n-2n+(n modulo 2))/4)
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EXAMPLE
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Some solutions for n=3
..0..0..1....3..0..2....2..0..1....0..3..0....2..0..0....3..3..3....0..2..2
..0..1..1....1..0..0....0..1..3....2..3..3....2..3..0....2..1..3....2..1..2
..3..1..2....0..1..1....1..3..3....3..2..2....2..2..3....0..2..0....0..2..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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