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A316119
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Number of nX4 0..1 arrays with every element unequal to 0, 2, 3, 5, 6 or 7 king-move adjacent elements, with upper left element zero.
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1
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1, 13, 23, 56, 213, 702, 2524, 9034, 33185, 120129, 440997, 1617873, 5923243, 21727149, 79684290, 292246407, 1071890143, 3931760361, 14421679034, 52899023769, 194038043140, 711745909568, 2610741818016, 9576434659125
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OFFSET
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1,2
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COMMENTS
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LINKS
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FORMULA
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Empirical recurrence of order 70 (see link above)
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EXAMPLE
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Some solutions for n=5
..0..1..1..0. .0..0..0..1. .0..1..1..1. .0..0..0..1. .0..0..0..0
..1..0..1..0. .1..1..0..0. .1..0..0..0. .1..1..1..0. .1..1..1..1
..1..0..0..0. .1..0..1..0. .0..1..1..0. .1..0..0..0. .1..0..0..1
..0..1..1..0. .0..0..1..0. .1..0..0..1. .1..0..1..0. .1..0..0..1
..1..0..0..1. .1..1..0..1. .0..1..1..0. .0..1..1..0. .1..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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