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A298180
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Number of nX5 0..1 arrays with every element equal to 3, 5, 6 or 8 king-move adjacent elements, with upper left element zero.
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1
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0, 3, 3, 6, 15, 27, 54, 117, 237, 508, 1073, 2261, 4852, 10375, 22175, 47602, 102187, 219583, 472170, 1015449, 2185065, 4703176, 10124077, 21797129, 46934664, 101069563, 217658203, 468756814, 1009568519, 2174384483, 4683219582
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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) = 2*a(n-1) +a(n-2) +a(n-3) -2*a(n-4) -5*a(n-5) -6*a(n-6) -4*a(n-7) +14*a(n-8) +6*a(n-9) -2*a(n-10)
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EXAMPLE
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Some solutions for n=7
..0..0..1..1..1. .0..0..1..1..1. .0..0..1..1..1. .0..0..0..1..1
..0..0..1..1..1. .0..0..1..1..1. .0..0..1..1..1. .0..0..0..1..1
..0..0..1..1..1. .0..0..1..1..1. .0..0..1..1..1. .0..0..0..1..1
..0..0..1..1..1. .0..0..1..1..1. .0..0..1..1..1. .0..0..0..1..1
..1..1..1..0..0. .1..1..1..1..1. .0..0..0..0..0. .0..0..0..1..1
..1..1..1..0..0. .1..1..1..0..0. .1..1..0..0..0. .1..1..0..0..0
..1..1..1..0..0. .1..1..1..0..0. .1..1..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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