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A298050
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Number of nX3 0..1 arrays with every element equal to 1, 2, 4 or 6 king-move adjacent elements, with upper left element zero.
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4
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1, 7, 15, 19, 23, 34, 63, 96, 147, 233, 368, 588, 933, 1500, 2404, 3842, 6157, 9887, 15907, 25577, 41128, 66175, 106524, 171543, 276293, 445096, 717116, 1155533, 1862256, 3001558, 4838268, 7799411, 12573667, 20271639, 32684289, 52699948
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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) = 3*a(n-1) -a(n-2) -2*a(n-3) -3*a(n-5) +3*a(n-6) +3*a(n-7) -a(n-8) +2*a(n-9) +6*a(n-10) -8*a(n-11) -3*a(n-12) -4*a(n-13) -2*a(n-14) +4*a(n-15) +8*a(n-16) -a(n-17) -3*a(n-18) for n>19
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EXAMPLE
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Some solutions for n=7
..0..0..1. .0..1..0. .0..1..1. .0..1..0. .0..1..1. .0..1..0. .0..1..0
..1..0..1. .1..0..1. .0..1..0. .0..1..0. .0..1..0. .1..0..1. .1..0..1
..0..1..0. .0..1..0. .1..1..0. .1..1..1. .1..0..1. .0..1..0. .0..1..0
..1..1..0. .1..0..1. .1..1..0. .1..1..1. .0..1..0. .1..0..1. .1..0..1
..1..1..0. .0..1..0. .0..1..0. .0..1..0. .1..0..1. .0..1..0. .0..1..0
..0..1..0. .1..0..1. .1..0..1. .1..0..0. .0..1..0. .1..0..1. .1..0..1
..0..1..1. .0..1..0. .0..1..0. .0..1..1. .1..0..1. .1..0..0. .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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