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A260922
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Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 00101011 or 01010101
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1
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104, 146, 401, 896, 1800, 3358, 7680, 14924, 32431, 62992, 139263, 269060, 591945, 1148020, 2528065, 4893596, 10776857, 20877196, 45968189, 89026604, 196045769, 379710316, 836112021, 1619399516, 3565959873, 6906609340, 15208409269
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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-2) +11*a(n-4) +13*a(n-6) -2*a(n-8) -2*a(n-10) +4*a(n-12) for n>15
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EXAMPLE
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Some solutions for n=4
..0..0..1..1..0....0..1..0..1..1....0..1..0..1..0....0..0..0..1..0
..0..1..0..0..0....0..0..1..0..0....0..0..1..0..1....1..0..1..0..1
..1..0..1..0..1....0..1..0..1..0....0..1..0..1..0....0..1..0..1..0
..0..1..0..1..0....1..0..1..0..1....1..0..1..0..1....1..0..0..0..1
..0..0..1..0..0....0..0..0..1..0....0..0..0..1..0....0..1..0..1..0
..1..1..0..1..0....1..0..1..0..1....0..1..1..0..1....1..0..1..0..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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