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A259511
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Number of (n+1)X(4+1) 0..1 arrays with each 2X2 subblock having clockwise pattern 0000 0001 0101 0111
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1
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245, 2219, 20293, 189211, 1769635, 16602297, 155863519, 1464104971, 13754727159, 129236342101, 1214294685989, 11409748154969, 107208173420527, 1007356261075135, 9465372066487451, 88939216552231467, 835696481415998163
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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) = 8*a(n-1) +61*a(n-2) -432*a(n-3) -936*a(n-4) +7415*a(n-5) +3311*a(n-6) -51997*a(n-7) +14878*a(n-8) +156464*a(n-9) -95087*a(n-10) -197708*a(n-11) +149042*a(n-12) +84334*a(n-13) -69090*a(n-14)
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EXAMPLE
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Some solutions for n=4
..1..0..0..0..1....1..0..0..0..0....0..0..0..0..0....1..0..0..0..1
..0..0..0..1..1....1..1..0..1..0....0..1..0..0..0....0..0..1..0..0
..0..0..1..1..0....1..0..1..0..0....1..0..1..0..0....1..0..0..1..0
..0..1..0..1..1....0..0..0..0..0....1..1..0..0..1....1..1..0..0..0
..0..0..0..0..1....1..0..0..0..1....1..0..0..1..1....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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