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A301350
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Number of nX4 0..1 arrays with every element equal to 1, 2, 3, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
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1
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2, 30, 277, 2349, 19561, 165010, 1392131, 11741731, 99032014, 835272398, 7045026710, 59420627072, 501178143148, 4227144439913, 35653491957422, 300716364726693, 2536366776713612, 21392771375921024, 180435523636242529
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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 72 (see link above)
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EXAMPLE
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Some solutions for n=5
..0..0..0..0. .0..0..1..1. .0..0..1..1. .0..0..0..0. .0..1..1..0
..1..0..1..1. .0..1..0..0. .0..1..0..0. .1..1..1..1. .0..0..1..0
..1..0..0..1. .0..1..0..0. .1..0..0..1. .0..1..0..0. .1..1..0..0
..1..1..0..1. .1..0..0..1. .0..1..1..1. .0..1..0..0. .1..0..1..0
..0..0..1..1. .1..1..1..1. .1..0..0..1. .0..1..1..0. .0..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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