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A207307
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Number of 4Xn 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 1 1 0 vertically
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1
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8, 64, 200, 643, 1759, 4939, 14446, 41505, 118266, 339548, 975493, 2795633, 8015023, 22994104, 65948845, 189120690, 542403026, 1555646545, 4461518045, 12795484071, 36697414724, 105247642363, 301847990088, 865695191094, 2482800552095
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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) +2*a(n-2) +8*a(n-3) +7*a(n-4) -2*a(n-5) -10*a(n-6) -10*a(n-7) -a(n-8) +3*a(n-9) +4*a(n-10) +a(n-11) -a(n-13) for n>14
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EXAMPLE
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Some solutions for n=4
..1..0..0..1....0..0..1..0....1..1..0..0....0..0..1..1....1..1..1..1
..0..1..1..0....1..0..0..1....1..1..0..0....1..0..0..1....1..1..1..1
..1..0..0..1....0..0..1..0....1..1..0..0....0..0..1..1....1..1..1..1
..1..1..1..1....1..0..0..1....1..1..0..0....0..0..1..1....1..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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