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A259957
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Number of (n+2) X (3+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001001.
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1
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155, 439, 1603, 5449, 18681, 64891, 222813, 764865, 2637815, 9090487, 31281933, 107674395, 370788133, 1276814309, 4396089911, 15135449051, 52112945503, 179433951141, 617811988681, 2127175449173, 7324071255063, 25217614284475
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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) +a(n-2) +12*a(n-3) +32*a(n-4) +44*a(n-5) +37*a(n-6) -32*a(n-7) -81*a(n-8) -12*a(n-9) +47*a(n-10) +38*a(n-11) +8*a(n-12) -6*a(n-13) -4*a(n-14) -4*a(n-15) for n>16.
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EXAMPLE
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Some solutions for n=4
..0..0..0..0..1....1..0..0..0..0....0..0..0..0..1....0..1..0..0..1
..0..0..0..0..0....0..1..0..0..0....0..0..0..1..0....0..0..0..0..0
..1..0..0..1..0....0..0..0..1..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..1..0
..0..0..0..0..0....0..0..1..0..0....0..0..0..0..0....0..1..0..0..0
..0..1..0..0..0....0..0..0..0..0....1..0..0..0..0....1..0..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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