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A202009
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Number of -n..n circular arrays x(0..6) of 7 elements with zero sums of x(i) and x(i)*x((i+1) mod 7)
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1
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85, 799, 2605, 7463, 14365, 33699, 53775, 90007, 136473, 213767, 289059, 433343, 552315, 763309, 989675, 1281575, 1548177, 2060815, 2445591, 3041291, 3622123, 4429993, 5095021, 6220341, 7131545, 8453999, 9715693, 11291939, 12624487
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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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EXAMPLE
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Some solutions for n=2
.-2....2....2...-2....0....0....2....2...-1....0...-1....0...-2...-1...-2...-1
.-2....0...-1....2...-2....0....0....0....1....2....1....0....1....0....2....1
.-1...-2...-2...-1....2....0....0...-1....1....0....1...-2...-2....0....1....1
..2....0...-1....2....1....1...-2...-2....2....1....0....2....1....2....2....0
..2....0....2....2....2....0....0....1...-2...-2....0....2....2....0...-1...-1
.-1....0....0...-1...-1....0...-2....0...-1...-2...-1....0....2....1...-2....0
..2....0....0...-2...-2...-1....2....0....0....1....0...-2...-2...-2....0....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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