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A199831
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Number of -7..7 arrays x(0..n+1) of n+2 elements with zero sum and no two neighbors summing to zero
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1
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140, 1820, 21364, 273728, 3579520, 47040968, 622300326, 8281149188, 110718596524, 1486040082748, 20010711643976, 270217094416868, 3657780168834780, 49618552941019396, 674346504318284036
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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=3
.-7...-1....5....0...-6....0....2...-3...-4....5...-7....4...-5...-6....0...-3
.-1....2...-7...-2...-5...-4....1...-7....3....0....6...-6....4....1....1...-3
.-4...-3...-6....6....3....6....3....0...-1...-7....2...-5....0...-3...-2....5
..7...-3....2....0....7...-5....1....3....5....5....0....3...-2....2....3....7
..5....5....6...-4....1....3...-7....7...-3...-3...-1....4....3....6...-2...-6
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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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