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A259767
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Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 or 00000101
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1
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104, 167, 256, 385, 612, 1108, 1708, 2700, 4660, 7378, 11350, 19232, 31280, 48032, 80218, 131336, 202926, 335260, 550228, 857598, 1403502, 2304624, 3618252, 5883582, 9653232, 15248198, 24687220, 40439420, 64203790, 103643474, 169453708
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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) = 3*a(n-3) +3*a(n-6) +4*a(n-7) -2*a(n-9) +2*a(n-11) -8*a(n-13) +6*a(n-14) for n>17
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EXAMPLE
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Some solutions for n=4
..0..0..1..0..0....0..1..0..0..0....0..0..1..0..1....0..0..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..0..0..0....0..0..0..0..0....0..0..1..0..0
..0..0..1..0..0....0..1..0..0..0....1..0..0..1..0....0..0..0..0..0
..0..1..0..0..0....1..0..0..0..1....0..0..0..0..1....0..0..0..0..0
..0..0..0..0..0....0..0..0..0..0....1..0..0..0..0....1..0..1..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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