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A253757
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Number of (n+2)X(1+2) 0..1 arrays with every 3X3 subblock diagonal median minus antidiagonal median nondecreasing horizontally and vertically
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2
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512, 2992, 16544, 82064, 423232, 2154496, 11244672, 58351744, 305405312, 1594118656, 8346515200, 43652413696, 228566467584, 1196268052480, 6263749533696, 32791986405376, 171701217935360, 898982481903616
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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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Empirical: a(n) = 6*a(n-1) +12*a(n-2) -96*a(n-3) +384*a(n-5) -192*a(n-6) -384*a(n-7) +256*a(n-8) for n>15
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EXAMPLE
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Some solutions for n=4
..0..0..0....0..1..0....1..0..1....0..1..0....0..0..1....0..1..1....1..1..1
..1..0..1....0..0..1....1..0..0....1..1..0....1..1..1....0..1..1....0..0..0
..0..1..0....0..0..1....1..0..1....0..0..0....1..1..0....0..0..0....1..0..1
..1..0..1....0..0..0....0..1..0....1..1..0....1..0..0....1..1..0....1..0..1
..0..1..0....0..0..0....0..0..1....1..1..1....0..1..1....0..1..0....1..1..1
..0..0..0....1..0..0....1..0..1....0..1..1....0..1..0....0..0..1....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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