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A260134
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Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 01010101 or 01010111
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1
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266, 730, 2966, 8292, 24696, 85048, 266156, 813540, 2626092, 8360396, 26119048, 82814452, 263115624, 829520604, 2621823280, 8306855180, 26259682284, 83003335876, 262648203728, 830734849888, 2626747254764, 8308477712268
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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) +16*a(n-3) +7*a(n-4) -14*a(n-5) -45*a(n-6) -14*a(n-7) +5*a(n-8) +38*a(n-9) +13*a(n-10) -6*a(n-11) -6*a(n-12) for n>13
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EXAMPLE
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Some solutions for n=4
..0..1..1..1..0..0....1..1..0..1..0..0....1..1..1..0..1..1....0..1..0..0..0..1
..1..0..1..0..1..0....1..0..1..0..1..0....0..1..0..1..1..1....1..0..1..0..1..0
..0..1..0..1..0..1....0..1..0..1..0..1....1..0..1..0..1..0....1..1..0..1..0..1
..0..0..1..0..1..0....1..0..1..0..1..0....0..1..0..1..0..1....1..0..1..0..1..0
..0..1..0..1..0..1....0..0..0..1..1..1....0..0..1..0..1..0....0..1..0..1..0..1
..1..0..1..0..0..0....1..0..1..0..1..1....0..1..0..1..1..1....1..1..1..0..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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