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A188117
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Number of strictly increasing arrangements of n nonzero numbers in -(n+2)..(n+2) with sum zero
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1
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0, 4, 8, 31, 90, 308, 1032, 3528, 12124, 42262, 148518, 525869, 1874648, 6725266, 24260940, 87958188, 320349712, 1171609968, 4301272078, 15846418258, 58569008756, 217121189648, 807123533172, 3008133255026, 11238226082080
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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
.-4...-7...-8...-6...-7...-8...-7...-8...-8...-5...-6...-5...-7...-8...-8...-3
.-3...-5...-6...-5...-3...-5...-5...-5...-6...-4...-4...-3...-6...-2...-7...-2
.-1...-1...-4...-3...-2...-3...-3...-3...-2...-1...-2...-2....1...-1....1...-1
..1....1....5....1...-1....3....4....2....2....1....1....1....3....1....2....1
..2....4....6....6....5....6....5....6....6....2....3....2....4....4....4....2
..5....8....7....7....8....7....6....8....8....7....8....7....5....6....8....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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