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A303317
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Number of 5Xn 0..1 arrays with every element equal to 0, 1, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
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1
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16, 9, 19, 74, 139, 410, 1799, 5907, 16494, 53290, 184915, 593160, 1846238, 5986532, 19644799, 63120477, 201894029, 652765881, 2113653016, 6806905917, 21913260238, 70736938785, 228339832475, 736091706666, 2373144545904, 7656031069031
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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) = 2*a(n-1) -a(n-2) +11*a(n-3) +21*a(n-4) -13*a(n-5) +5*a(n-6) -37*a(n-7) -34*a(n-8) +4*a(n-9) -20*a(n-10) +18*a(n-11) -7*a(n-12) for n>16
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EXAMPLE
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Some solutions for n=5
..0..1..0..1..0. .0..0..0..1..0. .0..1..0..1..0. .0..0..0..1..0
..0..0..0..1..0. .0..1..0..1..0. .0..1..1..1..0. .0..1..0..1..0
..0..1..1..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0
..0..1..0..0..0. .0..0..0..1..0. .0..1..0..0..0. .0..1..0..0..0
..0..1..0..1..1. .0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..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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