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A206204
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Number of (n+1)X7 0..3 arrays with every 2X3 or 3X2 subblock having exactly one clockwise edge increases
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1
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117084, 67968, 60800, 109720, 236488, 484704, 1080648, 2383520, 5023520, 11272288, 24906080, 51970688, 113273344, 249152672, 519714752, 1132733728, 2491526720, 5197147520, 11327337280, 24915267200, 51971475200, 113273372800
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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) = 10*a(n-3) for n>16
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EXAMPLE
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Some solutions for n=4
..0..3..1..1..2..2..2....1..0..0..0..0..3..1....3..0..0..3..1..1..1
..0..0..1..1..1..2..2....2..3..3..0..0..0..1....0..0..0..1..1..1..3
..0..0..0..1..1..1..2....2..3..3..3..0..0..0....0..0..1..1..1..2..2
..1..0..0..0..1..1..1....2..2..3..3..3..0..0....0..1..1..1..2..2..2
..2..2..0..0..0..1..1....2..2..2..3..3..3..0....0..1..1..2..2..2..1
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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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