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A317513
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Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 3, 4, 5, 6 or 7 king-move adjacent elements, with upper left element zero.
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1
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8, 128, 2032, 32256, 512096, 8130048, 129072576, 2049155072, 32532368768, 516483614720, 8199689547520, 130178202673152, 2066708056827392, 32811039824240640, 520907793817967616, 8269927777778991104
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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) = 16*a(n-1) -6*a(n-2) +64*a(n-3)
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EXAMPLE
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Some solutions for n=5
..0..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..1. .0..0..0..0
..1..1..0..0. .1..1..1..0. .0..0..0..0. .0..0..1..0. .1..0..1..0
..0..0..0..0. .0..1..1..0. .1..0..1..0. .1..0..1..1. .1..0..1..0
..1..0..0..1. .1..1..1..0. .0..1..0..0. .1..1..1..0. .0..0..1..1
..0..0..1..1. .1..0..1..0. .1..0..0..0. .1..1..1..0. .1..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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