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A299932
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Number of nX3 0..1 arrays with every element equal to 1, 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.
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1
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1, 18, 130, 902, 6243, 43375, 300901, 2088188, 14490885, 100561673, 697859666, 4842887731, 33607835172, 233225868721, 1618500688831, 11231792221332, 77944456338104, 540905507962400, 3753682843565441, 26049161421235915
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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) = 7*a(n-1) +2*a(n-2) -19*a(n-3) +15*a(n-4) +3*a(n-5) -3*a(n-6) -2*a(n-7) -10*a(n-8) -3*a(n-9) +2*a(n-10) for n>11
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EXAMPLE
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Some solutions for n=5
..0..1..1. .0..0..1. .0..0..0. .0..1..1. .0..0..0. .0..1..0. .0..0..0
..0..1..0. .1..1..0. .0..1..1. .0..0..0. .0..0..0. .1..0..1. .0..0..1
..1..0..1. .1..1..1. .0..0..1. .0..1..0. .0..0..0. .0..0..1. .0..1..1
..0..1..0. .0..1..0. .0..0..0. .1..1..1. .1..0..0. .1..1..0. .1..1..1
..0..0..0. .0..1..0. .0..1..1. .0..0..1. .0..1..1. .1..1..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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