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A188229
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Number of nondecreasing arrangements of n numbers in -n..n with sum zero and not more than two numbers equal
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1
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1, 3, 7, 30, 119, 527, 2395, 11376, 55368, 275735, 1397063, 7185356, 37419881, 196993233, 1046785509, 5608211846, 30264466262, 164375822152, 897938065590, 4930713542112, 27202861579741, 150721902660263, 838367664692809
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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
.-3...-2...-3...-2...-3...-4...-4...-4...-3...-4...-1...-2...-4...-3...-3...-1
.-2...-2...-3....0...-1...-2...-4....0....0...-3....0...-1....0...-3...-1...-1
..2....0....2....0....2....2....4....0....1....3....0...-1....2....3....0....0
..3....4....4....2....2....4....4....4....2....4....1....4....2....3....4....2
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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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