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A300800
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Number of nX4 0..1 arrays with every element equal to 0, 1, 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
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1
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8, 128, 1672, 23096, 317504, 4369224, 60123512, 827349312, 11385017480, 156667360584, 2155873946064, 29666629068872, 408237634914104, 5617691385723248, 77304133197516952, 1063769545014926728
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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) = 13*a(n-1) +14*a(n-2) -44*a(n-3) -63*a(n-4) +a(n-5) -17*a(n-6) +11*a(n-7) -36*a(n-8) -6*a(n-9) -a(n-10) +a(n-11)
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EXAMPLE
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Some solutions for n=5
..0..0..0..1. .0..0..0..1. .0..0..1..0. .0..0..0..0. .0..0..0..0
..0..0..1..0. .0..0..0..0. .0..1..0..1. .1..0..0..1. .0..1..0..0
..1..0..0..0. .1..1..0..1. .1..1..0..1. .1..1..0..1. .1..0..1..1
..0..0..1..0. .0..1..0..0. .1..1..0..0. .0..0..0..0. .0..0..1..1
..1..1..0..0. .0..0..1..1. .0..0..0..0. .1..1..1..1. .0..1..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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