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A297677
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Number of n X 3 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0, 1 or 4 neighboring 1's.
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1
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7, 29, 150, 742, 3744, 18840, 94891, 477850, 2406649, 12120617, 61043229, 307433020, 1548331209, 7797889752, 39272660089, 197789648884, 996131790595, 5016837561113, 25266394843590, 127249627060291, 640869727748787
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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) = 5*a(n-1) -a(n-2) +8*a(n-3) -5*a(n-4) -30*a(n-5) +17*a(n-6).
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EXAMPLE
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Some solutions for n=7
..1..0..1. .0..1..0. .0..0..0. .0..0..1. .1..0..1. .0..1..0. .1..0..1
..1..0..0. .1..0..0. .0..0..1. .0..0..1. .1..0..0. .1..0..0. .1..0..0
..1..0..0. .0..0..1. .0..0..1. .0..1..0. .0..0..0. .0..0..0. .1..1..1
..0..1..0. .0..0..0. .1..0..0. .0..1..0. .0..0..1. .1..1..0. .1..0..0
..0..0..0. .0..0..1. .1..0..0. .0..0..1. .1..0..1. .0..0..0. .1..0..1
..0..1..0. .0..0..0. .1..0..0. .0..0..0. .0..1..0. .1..0..1. .0..0..0
..0..1..0. .0..0..1. .0..0..1. .1..1..0. .1..0..1. .0..0..0. .0..1..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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