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A304144
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Number of nX3 0..1 arrays with every element unequal to 1, 2, 3 or 6 king-move adjacent elements, with upper left element zero.
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1
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1, 14, 18, 25, 113, 238, 359, 1309, 3091, 5173, 15475, 39432, 72084, 189527, 495712, 981404, 2379279, 6211445, 13097776, 30387724, 77976438, 172291180, 391956305, 983542082, 2243798047, 5079682165, 12475410712, 29036847557, 65931275352
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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) = a(n-1) +3*a(n-2) +11*a(n-3) -5*a(n-4) -39*a(n-5) -29*a(n-6) +4*a(n-7) +42*a(n-8) +15*a(n-9) +12*a(n-10) -2*a(n-11) -4*a(n-12) -16*a(n-13) -8*a(n-14) for n>16
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EXAMPLE
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Some solutions for n=5
..0..1..0. .0..1..0. .0..1..0. .0..1..0. .0..1..0. .0..0..1. .0..0..0
..0..1..1. .1..1..0. .1..1..1. .1..1..1. .1..1..0. .1..0..1. .1..1..1
..0..0..0. .0..0..0. .1..1..1. .1..0..1. .0..0..0. .1..1..1. .1..1..1
..0..0..0. .0..1..0. .1..0..1. .1..0..0. .0..0..0. .1..0..1. .0..0..1
..1..1..1. .0..1..1. .0..1..0. .1..1..1. .1..1..1. .0..0..1. .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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