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A209963
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Number of (n+1)X3 0..3 arrays containing all values 0..3 with every 2X2 subblock having one or two distinct values, and new values 0..3 introduced in row major order
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1
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0, 26, 665, 13529, 235614, 3745144, 56080379, 806021187, 11250016056, 153671659498, 2065329135285, 27415388492285, 360428944284258, 4702933675666684, 60999760074268959, 787454521196946391
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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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FORMULA
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Empirical: a(n) = 33*a(n-1) -374*a(n-2) +1586*a(n-3) -1093*a(n-4) -4559*a(n-5) +7212*a(n-6) -420*a(n-7) -4336*a(n-8) +2208*a(n-9) -256*a(n-10)
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EXAMPLE
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Some solutions for n=4
..0..1..0....0..0..0....0..0..1....0..0..0....0..0..0....0..0..0....0..0..0
..0..0..0....0..0..0....0..1..0....0..1..1....0..1..0....0..0..1....0..1..0
..0..2..0....0..0..0....0..0..1....0..1..0....0..1..0....2..0..0....0..0..0
..0..2..2....1..1..1....0..0..0....0..0..0....1..1..1....0..2..2....0..2..2
..0..2..3....2..1..3....2..0..3....2..0..3....2..1..3....2..2..3....2..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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