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A207414
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Number of nX3 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 1 1 and 1 0 1 vertically
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2
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6, 36, 92, 241, 720, 1889, 4719, 12102, 30414, 74588, 182737, 445468, 1075185, 2583413, 6187826, 14753420, 35052328, 83069841, 196345572, 462972905, 1089545883, 2559508250, 6002666694, 14057272936, 32876868289, 76799290072
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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-1) -4*a(n-2) +7*a(n-3) -21*a(n-4) +7*a(n-5) -a(n-6) +33*a(n-7) +7*a(n-8) -13*a(n-9) -35*a(n-10) -7*a(n-11) +9*a(n-12) +17*a(n-13) +4*a(n-14) -3*a(n-15) -3*a(n-16)
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EXAMPLE
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Some solutions for n=4
..1..0..1....1..0..0....0..1..1....0..0..0....1..0..0....1..1..1....0..1..1
..0..1..1....0..0..0....0..1..1....0..1..1....0..1..1....1..1..1....1..0..0
..0..0..0....0..1..1....0..1..1....0..0..0....0..0..0....0..1..1....0..0..0
..1..0..0....0..0..0....1..1..1....0..0..0....0..0..0....0..1..1....0..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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