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A204964
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Number of (n+2)X3 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally at least two different ways, and new values 0..1 introduced in row major order
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1
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166, 1001, 6086, 36522, 219755, 1323027, 7962992, 47928592, 288482790, 1736374118, 10451212777, 62905729186, 378628840855, 2278962509607, 13717048411662, 82562752244975, 496944229784914, 2991101444785801
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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) = 6*a(n-1) +6*a(n-3) -28*a(n-4) -25*a(n-5) +4*a(n-6) +2*a(n-7) +85*a(n-8) -46*a(n-9) +68*a(n-10) +46*a(n-11) -20*a(n-12) +12*a(n-13) -48*a(n-14) +16*a(n-15)
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EXAMPLE
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Some solutions for n=3
..0..0..1....0..1..0....0..0..0....0..0..1....0..0..0....0..0..0....0..1..0
..0..1..1....1..0..0....1..1..1....0..0..0....1..0..0....0..0..1....0..1..1
..1..1..1....1..0..0....1..1..1....1..1..0....0..1..1....1..0..1....0..1..1
..1..1..1....1..1..1....0..0..0....0..0..0....1..1..1....0..0..1....0..1..1
..1..1..1....1..0..1....0..1..1....0..0..0....0..0..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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