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A209809
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Number of (n+1)X4 0..3 arrays with every 2X2 subblock having two distinct values, and new values 0..3 introduced in row major order
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1
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173, 2721, 43209, 712829, 11912459, 201392025, 3428713825, 58668627061, 1007251262049, 17332656663131, 298717962915543, 5153570546264489, 88972824040813647, 1536771179571237129, 26551969300854432109
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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) = 26*a(n-1) -68*a(n-2) -1905*a(n-3) +6356*a(n-4) +40342*a(n-5) -117881*a(n-6) -302966*a(n-7) +604526*a(n-8) +940543*a(n-9) -1163096*a(n-10) -1137756*a(n-11) +834912*a(n-12) +402624*a(n-13) -124416*a(n-14)
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EXAMPLE
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Some solutions for n=4
..0..1..0..1....0..0..1..0....0..0..0..0....0..0..1..0....0..0..0..1
..0..1..0..0....0..1..1..0....0..1..0..1....2..0..1..0....0..1..0..0
..0..0..0..1....0..0..0..1....0..0..0..0....2..0..1..0....0..0..0..1
..0..2..0..0....1..0..1..1....0..1..1..0....0..0..0..0....0..1..0..0
..0..2..0..1....1..0..0..0....0..0..0..1....1..1..0..2....0..0..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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