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A260976
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Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00001001 or 00100101
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1
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483, 481, 732, 1513, 2714, 5506, 9728, 18578, 33658, 66832, 122644, 237212, 431888, 836918, 1545484, 2982194, 5509198, 10561098, 19597590, 37523150, 69861252, 133304344, 248584050, 473406314, 884926304, 1682544698, 3149522270
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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) = 2*a(n-2) +4*a(n-4) +5*a(n-5) -5*a(n-7) -2*a(n-8) -12*a(n-9) +7*a(n-10) +11*a(n-11) +2*a(n-12) +a(n-13) -4*a(n-15) -11*a(n-16) -8*a(n-17) -a(n-18) -4*a(n-19) for n>26
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EXAMPLE
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Some solutions for n=4
..0..0..0..1..0..1....0..0..0..0..1..0....0..1..0..0..0..1....1..0..0..0..0..1
..0..0..1..0..0..0....0..0..1..0..0..1....0..0..0..0..1..0....0..1..0..0..1..0
..1..0..0..0..1..0....1..0..0..1..0..0....0..0..1..0..0..0....0..0..0..0..0..0
..0..0..0..1..0..0....0..1..0..0..0..0....0..0..0..1..0..0....1..0..0..0..0..1
..0..0..0..0..0..1....0..0..0..0..1..0....0..1..0..0..0..0....0..0..1..0..0..0
..1..0..0..0..1..0....1..0..0..0..0..1....1..0..0..0..1..0....0..1..0..0..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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