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A199699
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Number of -3..3 arrays x(0..n-1) of n elements with zero sum and no two neighbors equal
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1
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1, 6, 32, 168, 892, 4964, 27854, 156920, 891684, 5095360, 29236016, 168361392, 972601784, 5633548460, 32706291872, 190266981972, 1108856802378, 6472638961608, 37836350087956, 221461180199752, 1297757839607606
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=5
..1....0....2...-3....1...-3...-2...-3...-2....0....1....2....2....2...-2....0
.-1....1....0....1....2....2....1....3...-1....2....2....0....0...-2...-3....3
.-3...-1....1...-2...-2....1...-2....0....0....1...-3...-1...-3....3....3....2
..3...-2...-3....1....0...-2....2....1....3...-2....1....1...-1...-1....2...-3
..0....2....0....3...-1....2....1...-1....0...-1...-1...-2....2...-2....0...-2
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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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