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A241109
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Number of nX3 0..2 arrays with no element equal to exactly three horizontal or vertical neighbors, with new values 0..2 introduced in row major order
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1
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5, 113, 2612, 60340, 1394492, 32228144, 744822776, 17213554688, 397821442776, 9194027810904, 212482632363880, 4910673535536216, 113490285320567816, 2622867264324958968, 60616930046792933096, 1400914281204947257016
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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) = 21*a(n-1) +48*a(n-2) +18*a(n-3) +16*a(n-4) -256*a(n-5) -636*a(n-6) -104*a(n-7) +560*a(n-8) +416*a(n-9) +64*a(n-10) -96*a(n-11) -64*a(n-12) for n>13
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EXAMPLE
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Some solutions for n=4
..0..1..0....0..1..2....0..0..1....0..0..1....0..1..0....0..1..0....0..1..0
..1..1..0....0..1..0....2..0..0....2..0..2....0..2..2....0..1..2....2..2..2
..0..0..1....0..2..0....0..2..2....1..1..0....2..0..2....2..0..2....2..0..2
..1..2..2....2..0..1....2..0..0....0..2..0....2..2..0....2..0..2....0..0..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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