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A188326
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Number of nondecreasing arrangements of n nonzero numbers in -n..n with sum zero
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1
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0, 2, 4, 20, 86, 424, 2128, 11200, 60372, 333254, 1872728, 10688284, 61792756, 361247006, 2132290212, 12692489494, 76115308712, 459476777038, 2790092370660, 17032567789840, 104478722395496, 643682329681246, 3981493201581658
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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=6
.-6...-4...-6...-4...-4...-5...-6...-4...-6...-4...-6...-6...-5...-6...-5...-3
.-5...-4...-3...-1...-3...-2...-5...-3...-6...-4...-3...-6...-4...-5...-4...-1
..1...-2...-3...-1...-2...-2...-2...-2...-3...-1....2....2...-3....1...-2...-1
..1....3....3...-1...-1....1....3...-2....3...-1....2....2....2....2....2...-1
..4....3....4....2....4....2....4....5....6....5....2....3....5....3....3....1
..5....4....5....5....6....6....6....6....6....5....3....5....5....5....6....5
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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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