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A221342
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Number of nX3 arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, with no occupancy greater than 2
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1
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7, 137, 2856, 60807, 1299057, 27767394, 593562702, 12688126159, 271223239234, 5797699341153, 123932233563380, 2649188126866350, 56629314186026164, 1210513943745878094, 25876068208481143920, 553129442930337241907
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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) = 43*a(n-1) -604*a(n-2) +3305*a(n-3) -5534*a(n-4) -8103*a(n-5) +18838*a(n-6) +17434*a(n-7) -4723*a(n-8) -11537*a(n-9) -7289*a(n-10) -2900*a(n-11) -652*a(n-12) -296*a(n-13) -94*a(n-14) -16*a(n-15)
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EXAMPLE
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Some solutions for n=3
..1..0..0....1..1..2....0..1..1....2..0..2....1..1..1....0..0..1....2..2..1
..1..1..2....0..0..2....0..2..0....2..2..1....0..0..1....0..1..2....0..1..0
..0..2..2....0..1..2....2..2..1....0..0..0....1..2..2....2..2..1....1..0..2
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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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