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A260760
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Number of (n+2)X(1+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010011
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1
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48, 82, 190, 350, 622, 1315, 2478, 4597, 9184, 17591, 33096, 64829, 124590, 236647, 458914, 883290, 1686838, 3255660, 6266216, 12003508, 23114992, 44476139, 85340062, 164169628, 315782978, 606459354, 1166124310, 2242522630, 4308761510
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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-3) +3*a(n-4) +2*a(n-5) +5*a(n-6) +5*a(n-8) +2*a(n-9) +3*a(n-10) +4*a(n-11) +2*a(n-12) +6*a(n-13) +a(n-14) for n>15
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EXAMPLE
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Some solutions for n=4
..0..0..1....0..0..1....0..1..1....0..0..1....1..0..0....0..0..1....1..1..0
..0..0..1....0..1..0....0..1..0....0..1..1....1..1..0....0..1..1....0..1..0
..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..1..0
..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0
..1..0..0....0..1..0....0..0..1....0..1..0....1..0..0....0..0..1....0..0..0
..1..0..0....0..0..1....0..0..0....1..1..0....0..0..0....0..0..0....1..1..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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