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A202798
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Number of nX4 binary arrays with every one adjacent to another one horizontally or vertically
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1
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7, 126, 1718, 22946, 311144, 4217066, 57127796, 773948962, 10485233258, 142050385280, 1924452482144, 26071860295098, 353213105139604, 4785216541174944, 64828561353680056, 878276318748587482
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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) = 13*a(n-1) -7*a(n-2) +181*a(n-3) +123*a(n-4) +940*a(n-5) +545*a(n-6) -2084*a(n-7) -1964*a(n-8) +1512*a(n-9) +1984*a(n-10) -512*a(n-11) -1024*a(n-12)
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EXAMPLE
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Some solutions for n=4
..0..0..1..1....1..1..0..0....1..1..1..0....0..1..1..0....0..0..0..0
..1..0..0..1....0..0..0..0....0..0..1..1....0..0..1..0....1..0..1..1
..1..1..1..0....0..0..1..1....1..1..1..0....0..0..0..0....1..1..0..0
..0..1..0..0....0..0..1..0....1..0..1..0....0..0..1..1....0..1..1..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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