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A299223
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Number of nX3 0..1 arrays with every element equal to 1, 2, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero.
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2
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1, 17, 113, 628, 3669, 21792, 128610, 758715, 4478515, 26434415, 156022822, 920895737, 5435426140, 32081622538, 189355989729, 1117639651783, 6596666844249, 38935638345812, 229810595428761, 1356415664939788
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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) = 5*a(n-1) +3*a(n-2) +16*a(n-3) -7*a(n-4) -32*a(n-5) -25*a(n-6) -62*a(n-7) +44*a(n-8) -57*a(n-9) -12*a(n-10) -74*a(n-11) +46*a(n-12) -20*a(n-13) -16*a(n-14) for n>16
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EXAMPLE
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Some solutions for n=5
..0..1..1. .0..0..1. .0..0..1. .0..1..1. .0..1..0. .0..0..1. .0..0..1
..0..1..0. .1..1..1. .1..0..1. .0..0..0. .0..1..0. .1..1..1. .1..1..1
..0..0..0. .1..1..1. .1..1..1. .0..0..0. .0..0..0. .1..1..1. .1..1..1
..0..0..0. .1..0..1. .1..1..1. .0..1..0. .0..0..0. .1..0..1. .1..0..1
..0..1..1. .0..0..0. .1..0..0. .1..1..0. .1..1..0. .0..1..0. .0..1..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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