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A207341
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Number of nX3 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 0 and 1 1 1 vertically
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4
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6, 36, 84, 292, 912, 2812, 8928, 28152, 87972, 277292, 872524, 2738692, 8615772, 27093728, 85142632, 267722916, 841747760, 2646047052, 8319199464, 26155059448, 82225749476, 258510349884, 812729058372, 2555098454212, 8032934120092
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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) = 4*a(n-2) +16*a(n-3) +13*a(n-4) -10*a(n-5) -17*a(n-6) -8*a(n-7) +2*a(n-8) -2*a(n-9) -a(n-10) for n>13
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EXAMPLE
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Some solutions for n=4
..0..0..1....1..1..0....1..0..1....1..0..0....1..0..1....1..1..1....0..0..1
..1..1..0....1..1..1....1..1..0....0..0..1....1..0..1....0..0..1....1..0..1
..0..0..1....0..0..1....0..1..0....1..1..1....0..1..0....0..1..0....0..1..0
..0..0..1....1..1..0....0..0..1....0..1..0....0..0..1....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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