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A206056
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Number of (n+1)X2 0..3 arrays with every 2X3 or 3X2 subblock having exactly two clockwise edge increases
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1
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256, 2184, 19832, 170688, 1499080, 13136860, 114770680, 1005245456, 8795691276, 76969708228, 673648635636, 5895121182756, 51591036898624, 451495015540276, 3951196323981332, 34578562282564776, 302610603775464632
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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) = 3*a(n-1) +34*a(n-2) +145*a(n-3) -18*a(n-4) -2*a(n-5) +11*a(n-6) +6*a(n-7) +2*a(n-8) +4*a(n-9) for n>10
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EXAMPLE
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Some solutions for n=4
..3..1....0..0....1..1....3..0....1..3....3..1....0..2....1..1....1..3....3..0
..1..3....1..0....0..3....1..2....2..2....3..1....3..3....2..2....1..0....2..0
..2..2....0..1....3..3....1..1....0..2....3..2....3..3....1..1....0..0....3..3
..1..1....1..1....1..1....3..0....2..1....3..1....1..0....0..0....0..2....1..2
..0..0....3..0....0..0....2..0....1..1....1..2....3..3....0..1....3..2....0..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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