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A183915
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Number of nondecreasing arrangements of n numbers in -7..7 with sum zero
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2
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1, 8, 32, 126, 414, 1242, 3370, 8512, 20094, 44916, 95514, 194668, 381676, 723354, 1328980, 2374753, 4136477, 7040196, 11728606, 19159798, 30734578, 48479188, 75277670, 115195490, 173885716, 259140928, 381577586, 555546058, 800247348
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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
.-6...-6...-4...-2...-3...-5...-7...-6...-3...-5...-5...-2...-3...-1...-7...-2
.-2...-1...-4...-2...-1...-3....0...-3...-1...-2...-1....0...-2...-1...-7...-2
..2....0....4....0....1....4....0....4....2....3....3....1....1....0....7....1
..6....7....4....4....3....4....7....5....2....4....3....1....4....2....7....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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