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A283950
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T(n,k)=Number of nXk 0..1 arrays with no 1 equal to more than three of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly one element.
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12
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0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 16, 87, 0, 0, 0, 84, 906, 900, 0, 0, 0, 408, 7988, 16648, 8184, 0, 0, 0, 1926, 69468, 264482, 283208, 71486, 0, 0, 0, 8776, 575456, 4242700, 8244557, 4510608, 597042, 0, 0, 0, 38912, 4604744, 64614384, 241796070, 242330064
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OFFSET
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1,8
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COMMENTS
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Table starts
.0.0......0........0..........0............0..............0................0
.0.0......2.......16.........84..........408...........1926.............8776
.0.0.....87......906.......7988........69468.........575456..........4604744
.0.0....900....16648.....264482......4242700.......64614384........948567440
.0.0...8184...283208....8244557....241796070.....6763514843.....182198176994
.0.0..71486..4510608..242330064..13010689912...667015216686...32960788748780
.0.0.597042.68693470.6816984648.669777003928.62944601744067.5709831013093658
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LINKS
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FORMULA
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Empirical for column k:
k=1: a(n) = a(n-1)
k=2: a(n) = a(n-1)
k=3: [order 16]
k=4: [order 34]
k=5: [order 90]
Empirical for row n:
n=1: a(n) = a(n-1)
n=2: [order 8]
n=3: [order 28]
n=4: [order 56]
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EXAMPLE
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Some solutions for n=4 k=4
..1..0..1..0. .0..1..1..1. .1..0..1..0. .1..1..0..1. .0..1..0..0
..1..1..0..1. .0..1..1..0. .0..0..0..1. .1..0..1..1. .0..0..0..1
..1..1..0..0. .1..1..0..0. .1..1..1..0. .0..1..0..0. .1..1..1..1
..1..1..0..0. .0..0..0..1. .1..1..0..1. .0..0..1..1. .0..1..0..0
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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