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A304130
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Number of nX5 0..1 arrays with every element unequal to 0, 1, 3 or 6 king-move adjacent elements, with upper left element zero.
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1
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8, 31, 33, 80, 176, 320, 582, 1112, 2178, 4222, 8066, 15568, 30220, 58392, 112902, 218678, 423402, 820096, 1588910, 3078264, 5965222, 11561350, 22406984, 43430950, 84187876, 163195112, 316358564, 613292350, 1188948430, 2304970530, 4468634064
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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-1) +8*a(n-3) -3*a(n-4) -23*a(n-6) -4*a(n-7) -4*a(n-8) +26*a(n-9) +19*a(n-10) +8*a(n-11) -10*a(n-12) -19*a(n-13) -4*a(n-14) +6*a(n-16) for n>22
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EXAMPLE
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Some solutions for n=5
..0..0..0..0..0. .0..1..1..0..0. .0..0..0..0..1. .0..1..1..1..1
..0..1..0..0..1. .1..1..1..1..0. .0..0..0..0..0. .0..0..1..1..1
..1..1..0..1..1. .1..1..1..1..1. .0..0..0..0..0. .0..0..0..1..1
..1..1..1..1..1. .0..1..1..0..0. .0..0..0..0..0. .0..1..1..1..1
..1..1..1..1..1. .0..0..1..0..1. .1..0..0..0..1. .0..0..1..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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