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A205266
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Number of (n+2)X3 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally, and new values 0..1 introduced in row major order
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1
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223, 1606, 11553, 82991, 596414, 4285989, 30799890, 221334561, 1590556222, 11430067537, 82138844381, 590266825510, 4241780221403, 30482315247698, 219052259713035, 1574155115721354, 11312206190476013, 81291867375432163
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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) +5*a(n-2) +26*a(n-3) -6*a(n-4) +14*a(n-5) -44*a(n-6) +23*a(n-7) +10*a(n-8) -15*a(n-9) -12*a(n-10) -12*a(n-11)
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EXAMPLE
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Some solutions for n=3
..0..1..1....0..1..0....0..1..1....0..1..1....0..1..1....0..1..0....0..1..0
..0..1..0....0..1..1....1..1..1....1..0..0....1..0..0....1..1..0....1..0..0
..1..1..0....0..1..0....1..1..1....1..0..0....1..1..1....0..1..1....0..1..0
..0..0..0....1..1..1....1..1..0....1..0..1....0..0..1....1..0..1....1..1..0
..1..0..0....0..0..1....1..0..1....1..0..1....0..1..1....0..1..1....1..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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