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A188206
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Number of nondecreasing arrangements of n numbers in -(n+2)..(n+2) with sum zero
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1
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1, 5, 18, 86, 414, 2137, 11322, 61731, 343363, 1943488, 11157558, 64841876, 380777798, 2256500525, 13479035412, 81085573679, 490856939495, 2988208167015, 18283978901128, 112390059830932, 693750864437218, 4298745830972544
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history;
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internal format)
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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=3
.-5...-3...-2...-5...-4...-3...-2...-2...-3...-5...-4...-3...-2....0...-4...-4
..0...-1....1....1...-1....0...-2....0...-2....2....0....1...-1....0....2....1
..5....4....1....4....5....3....4....2....5....3....4....2....3....0....2....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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