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A188233
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Number of nondecreasing arrangements of n numbers in -(n+4)..(n+4) with sum zero and not more than two numbers equal
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1
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1, 7, 31, 172, 903, 4859, 26123, 141519, 769915, 4209720, 23118268, 127495912, 705885128, 3922515554, 21871461990, 122341995397, 686381562245, 3861568338064, 21781724157952, 123162942539680, 698010289536681
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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=4
.-7...-3...-4...-6...-5...-7...-3...-4...-8...-8...-3...-6...-7...-8...-8...-6
.-5...-1...-2...-2...-5....1...-3...-4...-3...-3...-2....0...-4...-5...-6...-5
..5....1....1....1....4....2....1....0....3....5....2....0....4....6....7....4
..7....3....5....7....6....4....5....8....8....6....3....6....7....7....7....7
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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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