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A304474
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Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 4 or 6 king-move adjacent elements, with upper left element zero.
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1
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4, 12, 19, 37, 94, 202, 428, 965, 2134, 4692, 10385, 22939, 50685, 112126, 247801, 547629, 1210890, 2677120, 5917928, 13083023, 28924080, 63944514, 141366373, 312528443, 690930487, 1527496422, 3376954419, 7465688699, 16504985560
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = a(n-2) +6*a(n-3) +8*a(n-4) +5*a(n-5) -6*a(n-6) -22*a(n-7) -25*a(n-8) -14*a(n-9) +2*a(n-10) +7*a(n-11) +3*a(n-12) for n>13
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EXAMPLE
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Some solutions for n=5
..0..1..0. .0..0..0. .0..0..0. .0..0..0. .0..0..0. .0..0..0. .0..1..1
..0..0..1. .0..0..0. .0..0..0. .1..1..0. .1..0..0. .0..0..0. .0..0..0
..0..1..1. .0..0..0. .0..1..1. .0..0..1. .0..1..0. .0..0..0. .0..0..0
..0..1..1. .0..0..0. .1..0..0. .1..1..1. .0..0..1. .0..0..1. .1..0..1
..1..1..1. .0..1..1. .1..1..1. .0..0..1. .0..0..0. .0..1..0. .1..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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