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A305092
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Number of nX3 0..1 arrays with every element unequal to 1, 2, 4, 6 or 7 king-move adjacent elements, with upper left element zero.
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1
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1, 9, 14, 17, 64, 158, 229, 630, 1626, 2950, 6627, 16872, 34743, 73749, 177939, 391569, 832239, 1918128, 4326797, 9358621, 21010056, 47538986, 104476103, 232064401, 522612729, 1159790910, 2570796250, 5758552148, 12835315322, 28485986767
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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: a(n) = 2*a(n-2) +11*a(n-3) +7*a(n-4) -16*a(n-5) -46*a(n-6) -31*a(n-7) +27*a(n-8) +64*a(n-9) +38*a(n-10) -20*a(n-11) -25*a(n-12) -6*a(n-13) +7*a(n-14) +a(n-15) -2*a(n-16) for n>17
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EXAMPLE
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Some solutions for n=5
..0..0..1. .0..1..1. .0..0..1. .0..1..0. .0..1..0. .0..0..1. .0..0..0
..0..1..0. .1..0..1. .0..1..0. .1..0..0. .1..0..0. .1..1..1. .0..1..1
..0..0..0. .1..1..1. .0..0..0. .0..0..0. .1..1..0. .1..1..1. .0..0..0
..0..1..0. .1..0..1. .0..0..0. .0..1..0. .1..0..1. .1..0..1. .0..1..1
..0..0..1. .1..0..1. .0..1..1. .0..1..0. .1..1..1. .1..0..1. .0..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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