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A189155
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Number of nX3 binary arrays without the pattern 0 0 1 1 diagonally, vertically or horizontally
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3
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8, 64, 512, 3375, 21952, 140608, 884736, 5545233, 34645976, 216000000, 1345572864, 8377795791, 52145952256, 324525966848, 2019487744000, 12566456507249, 78194107594728, 486552055503808, 3027480871826944, 18837870152811039
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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) = 7*a(n-1) -a(n-2) +a(n-3) -164*a(n-4) +28*a(n-5) +68*a(n-6) +684*a(n-7) +66*a(n-8) +66*a(n-9) -726*a(n-10) -138*a(n-11) -132*a(n-12) +220*a(n-13) +20*a(n-14) +28*a(n-15) -25*a(n-16) -a(n-17) -a(n-18) +a(n-19)
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EXAMPLE
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Some solutions for 4X3
..0..0..1....1..0..1....0..0..0....0..1..1....1..1..0....1..0..0....0..0..1
..0..0..0....0..1..0....0..0..0....1..0..1....0..1..0....0..1..1....1..0..0
..0..1..0....0..0..1....0..0..0....0..0..0....1..0..0....1..1..0....0..0..1
..0..0..0....1..0..0....0..1..1....0..1..0....1..1..0....0..1..1....0..0..0
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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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