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A299316
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Number of nX3 0..1 arrays with every element equal to 0, 3, 4, 5, 6 or 7 king-move adjacent elements, with upper left element zero.
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1
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1, 1, 15, 10, 70, 146, 434, 1206, 3228, 9186, 24772, 69398, 189942, 526396, 1450524, 4005122, 11055658, 30506770, 84220672, 232416524, 641554400, 1770641470, 4887237832, 13489036144, 37230869642, 102760304362, 283626021494
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OFFSET
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1,3
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 2*a(n-1) +5*a(n-2) -5*a(n-3) -10*a(n-4) +4*a(n-5) +a(n-6) +3*a(n-7) -3*a(n-8) +4*a(n-9) -2*a(n-10) for n>12
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EXAMPLE
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Some solutions for n=5
..0..0..1. .0..0..0. .0..1..0. .0..0..0. .0..0..1. .0..1..1. .0..1..0
..0..0..0. .0..0..0. .1..1..1. .0..0..0. .0..0..0. .1..1..1. .1..1..1
..0..0..0. .1..0..1. .0..1..0. .0..0..1. .0..1..0. .0..1..1. .1..0..1
..1..1..1. .0..0..0. .1..1..1. .0..0..0. .0..0..0. .1..1..1. .1..1..1
..1..1..1. .0..0..0. .0..1..1. .1..0..1. .1..0..0. .0..1..0. .1..1..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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