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A188118
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Number of strictly increasing arrangements of n nonzero numbers in -(n+3)..(n+3) with sum zero
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1
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0, 5, 12, 51, 172, 624, 2216, 7970, 28660, 103599, 375854, 1368883, 5003340, 18351050, 67525962, 249235562, 922567826, 3424217898, 12741735980, 47526320684, 177671217830, 665611279282, 2498575823284, 9396889413586
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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
.-7...-8...-7...-9...-8...-9...-9...-9...-9...-8...-8...-8...-9...-9...-7...-8
.-5...-5...-6...-6...-7...-4...-4...-3...-4...-4...-7...-5...-4...-6...-5...-6
.-3...-2...-5...-5...-2...-1...-3....1...-3...-3....1....1...-2...-1...-1...-3
..1....2....3....5....2....1....1....2...-1....2....2....3...-1....1....1....3
..6....5....6....6....6....5....7....4....8....4....3....4....7....6....4....6
..8....8....9....9....9....8....8....5....9....9....9....5....9....9....8....8
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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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