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A207048
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Number of (n+1) X 7 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly one clockwise edge increases.
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1
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13386, 4722, 3408, 4836, 7584, 11712, 19200, 30528, 48096, 78744, 125184, 196320, 316128, 500832, 785280, 1264512, 2003328, 3141120, 5058048, 8013312, 12564480, 20232192, 32053248, 50257920, 80928768, 128212992, 201031680, 323715072
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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) = 4*a(n-3) n > 14.
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EXAMPLE
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Some solutions for n=4
..1..2..2..1..1..1..2....0..2..1..1..2..2..2....1..0..2..2..0..0..0
..1..2..2..2..1..1..1....0..0..1..1..1..2..2....1..1..2..2..2..0..0
..1..1..2..2..2..1..1....0..0..0..1..1..1..2....1..1..1..2..2..2..0
..1..1..1..2..2..2..0....1..0..0..0..1..1..1....2..1..1..1..2..2..2
..0..1..1..1..2..2..2....1..1..0..0..0..1..1....2..0..1..1..1..2..2
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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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