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A209824
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Number of (n+1)X4 0..2 arrays with every 2X2 subblock having one or two distinct values, and new values 0..2 introduced in row major order
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1
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218, 4418, 90000, 1842509, 37744836, 773359089, 15846003427, 324684577671, 6652797311199, 136316077450664, 2793121983572647, 57231184269590694, 1172669322792974754, 24028042740488215416, 492335585844232823766
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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) = 24*a(n-1) -62*a(n-2) -226*a(n-3) +445*a(n-4) +475*a(n-5) -811*a(n-6) +29*a(n-7) +147*a(n-8) -20*a(n-9)
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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..1....0..1..0..0....0..0..0..0
..1..0..0..0....0..1..1..1....2..2..0..0....0..1..0..0....0..1..0..0
..1..0..2..2....0..0..1..2....1..2..0..1....0..1..0..2....0..0..0..2
..1..0..2..1....2..0..1..1....2..2..0..0....0..0..0..2....0..0..2..2
..1..0..2..1....2..0..0..1....0..2..2..0....2..0..0..2....0..2..2..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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