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A280475
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Number of nX3 0..2 arrays with no element unequal to a strict majority of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.
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1
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0, 22, 208, 1939, 17406, 149057, 1224092, 9717407, 75078490, 567486429, 4212636472, 30802884219, 222362166198, 1587624277241, 11227499711316, 78737492563415, 548110879578258, 3790518591777685, 26059838687117808
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OFFSET
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1,2
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 27*a(n-1) -303*a(n-2) +1857*a(n-3) -6924*a(n-4) +16608*a(n-5) -26048*a(n-6) +26112*a(n-7) -15360*a(n-8) +4096*a(n-9) for n>10
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EXAMPLE
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Some solutions for n=4
..0..0..1. .0..0..0. .0..0..0. .0..0..1. .0..0..1. .0..1..1. .0..1..1
..1..1..2. .1..2..0. .0..0..1. .0..1..0. .0..1..1. .1..0..0. .1..1..2
..2..2..0. .0..0..2. .0..0..2. .0..0..0. .2..2..1. .0..0..2. .1..2..0
..1..1..1. .0..2..2. .0..0..0. .0..2..2. .0..0..0. .1..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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