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A207363
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Number of nX3 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 0 1 1 vertically
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4
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6, 36, 90, 225, 420, 784, 1260, 2025, 2970, 4356, 6006, 8281, 10920, 14400, 18360, 23409, 29070, 36100, 43890, 53361, 63756, 76176, 89700, 105625, 122850, 142884, 164430, 189225, 215760, 246016, 278256, 314721, 353430, 396900, 442890, 494209
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OFFSET
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1,1
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COMMENTS
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Column 3 of A207368
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..210
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FORMULA
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Empirical: a(n) = 2*a(n-1) +2*a(n-2) -6*a(n-3) +6*a(n-5) -2*a(n-6) -2*a(n-7) +a(n-8)
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EXAMPLE
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Some solutions for n=4
..1..1..1....0..0..1....0..1..0....1..1..1....0..1..0....1..1..0....0..1..0
..1..1..1....0..1..0....1..1..0....1..1..1....1..1..0....0..0..1....0..1..0
..0..1..0....0..0..1....0..1..0....1..1..1....0..1..0....0..1..0....0..1..0
..0..1..0....0..1..0....0..1..0....1..1..1....1..0..0....0..0..1....0..1..0
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CROSSREFS
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Sequence in context: A207656 A207341 A152746 * A207600 A207026 A207171
Adjacent sequences: A207360 A207361 A207362 * A207364 A207365 A207366
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Feb 17 2012
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STATUS
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approved
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