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A202961
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Number of arrays of n+2 integers in -7..7 with sum zero and adjacent elements differing in absolute value
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1
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128, 1576, 17296, 207184, 2537024, 31155004, 384996502, 4786979780, 59791891464, 749603860520, 9427927830076, 118904758131236, 1503198371854568, 19043136745799960, 241690849746856584, 3072505406058890180
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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
..4...-3....6...-6...-4...-7...-1....1...-3....0....1...-7....0....0....5....1
..2....7....0....0...-6....1...-3....0...-4....7...-7...-1....2...-3....2....3
.-5....2...-7....5....0...-5....1....2....2...-6...-1....7....7....1...-4....1
..6....0...-6...-3....4....4....0...-5...-1...-3....2....2...-3....0...-1...-5
.-7...-6....7....4....6....7....3....2....6....2....5...-1...-6....2...-2....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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