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A200425
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Number of -3..3 arrays x(0..n+2) of n+3 elements with zero sum and no two or three adjacent elements summing to zero
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1
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92, 520, 2232, 9898, 50592, 270848, 1432402, 7469120, 38883992, 203526914, 1071337158, 5658347658, 29934599276, 158560687098, 841075030030, 4468272429398, 23771639720040, 126620792508358, 675163140324368
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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
..1....1....1...-3....0....0....2....3...-1....0....0...-1....1....1...-3...-2
.-2...-3....3....2....2....3...-3...-1....2...-1...-3...-3....2....1....0....1
.-2...-3....3....0...-3....3....0....0....3....2....1....0....1....0...-3....3
.-2....2...-2....2...-2...-2...-1...-3...-1...-3....3....2....0...-3....1....2
..3....0...-3....2....1...-2....0...-1....0....0....0....0...-2...-2....3...-1
..2....3...-2...-3....2...-2....2....2...-3....2...-1....2...-2....3....2...-3
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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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