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A301998
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Number of nX7 0..1 arrays with every element equal to 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.
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1
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8, 128, 1108, 10982, 122232, 1366374, 15243860, 169636124, 1884309898, 20919022400, 232254936138, 2579000358404, 28639373845122, 318037976285038, 3531770886607536, 39219734913406306, 435528277377832336
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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 52 (see link above)
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EXAMPLE
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Some solutions for n=5
..0..0..1..0..1..0..0. .0..0..1..1..1..1..0. .0..0..1..0..0..1..1
..0..1..0..1..0..1..1. .0..0..0..0..1..0..1. .0..1..1..0..1..0..0
..1..0..0..1..0..1..0. .1..1..0..1..0..1..0. .0..0..1..1..0..1..1
..1..1..1..0..1..0..0. .1..1..0..1..1..0..1. .1..1..0..1..0..0..0
..0..0..0..1..1..1..1. .0..0..1..0..0..1..1. .0..0..1..1..1..0..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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