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A188175
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Number of strictly increasing arrangements of n numbers in -(n+1)..(n+1) with sum zero
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1
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1, 3, 8, 24, 73, 227, 734, 2430, 8150, 27718, 95514, 332578, 1168261, 4136477, 14749992, 52925886, 190973410, 692583902, 2523265494, 9231352260, 33901898722, 124940568222, 461938289518, 1713007181342, 6369928427268, 23747917426918
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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=5
.-6...-5...-3...-4...-6...-4...-5...-4...-5...-3...-5...-6...-6...-6...-6...-5
.-2...-1...-2...-3...-3...-2...-4...-3...-3...-2...-3...-1...-1...-3...-2...-3
..0....0...-1...-1....0....0....0....0....0...-1....0....0....0....1....1....1
..2....1....2....3....3....2....3....1....3....1....2....3....2....3....3....2
..6....5....4....5....6....4....6....6....5....5....6....4....5....5....4....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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