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A303417
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Number of nX4 0..1 arrays with every element equal to 0, 1, 2, 3, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
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1
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8, 128, 1985, 30897, 480960, 7486369, 116529645, 1813851698, 28233652317, 439473157219, 6840654335738, 106478748377005, 1657403414891639, 25798444493138200, 401567736789419233, 6250634501358061189
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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) = 14*a(n-1) +21*a(n-2) +54*a(n-3) -23*a(n-4) -18*a(n-5) -20*a(n-6)
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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..0..1..1. .0..0..0..0. .0..1..1..0. .1..0..1..0. .1..1..1..0
..0..0..0..1. .1..1..1..1. .1..1..1..1. .0..1..1..1. .0..1..0..1
..0..1..1..1. .0..0..0..0. .0..0..1..0. .0..0..1..1. .1..0..0..0
..1..1..1..0. .0..0..0..1. .0..1..0..1. .1..1..0..1. .0..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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