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A183933
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Number of nondecreasing arrangements of n numbers in -7..7 with sum zero and sum of squares less than n*56/3
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1
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1, 5, 20, 83, 262, 777, 2117, 5278, 12353, 27893, 58831, 118985, 235504, 443653, 810431, 1459822, 2529977, 4285656, 7192569, 11698167, 18689016, 29678739, 45907880, 70000817, 106315189, 157902365, 231761845, 339336920, 487306673
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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
.-5...-2...-3...-3...-4...-6...-5...-3...-5...-3...-7...-4...-6...-3...-4...-1
.-2...-2...-1....0...-3....0....1...-2...-1...-3....1...-2...-1...-1...-2...-1
..1....0....0....0....2....0....1....1....0....3....3....0....2....2....1....1
..6....4....4....3....5....6....3....4....6....3....3....6....5....2....5....1
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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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