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A302068
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Number of nX7 0..1 arrays with every element equal to 0, 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.
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1
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64, 2778, 89658, 3247765, 119508742, 4418931065, 163660519064, 6065045335103, 224815724811979, 8334107796606201, 308963355935563199, 11454095498949273706, 424636110620978141873, 15742508225166053482704
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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 recurrence of order 53 (see link above)
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EXAMPLE
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Some solutions for n=5
..0..1..0..0..1..1..0. .0..1..0..0..1..0..1. .0..1..0..0..1..1..0
..0..0..0..1..0..1..1. .0..0..0..0..1..0..1. .0..0..0..1..0..1..1
..0..1..0..0..0..0..1. .0..0..0..1..1..0..0. .0..1..0..0..1..0..0
..0..0..0..1..1..0..1. .0..1..0..1..0..1..0. .0..1..1..0..1..1..0
..0..1..0..0..0..1..0. .1..0..1..1..0..1..1. .0..1..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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