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A208803
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Number of n-bead necklaces labeled with numbers -6..6 allowing reversal, with sum zero and three times sum of squares <= n*(6)*(6+1).
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1
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1, 4, 17, 136, 1073, 10372, 105147, 1111859, 11969879, 132339307, 1483656527, 16847824961, 193620920219, 2242918877972, 26215739119341, 308466499187272, 3650953780091983, 43460429194159752, 519724194908777521, 6242649556702436466
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OFFSET
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1,2
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LINKS
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EXAMPLE
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Some solutions for n=6:
.-6...-3...-5...-4...-5...-5...-4...-4...-3...-5...-5...-5...-5...-6...-5...-3
..1....2...-1....4...-1....1....3...-3...-3....0...-2...-1...-4...-1....3....1
..0...-2....2...-3...-3....2....0....4...-1...-3....3...-2....2....0....0....1
..2....3....0...-1....6...-3...-3...-2....5....3....2....3....1....5...-1...-2
..0...-2....3...-2....0....1...-1....4....2....2....3....6....2....2...-1....0
..3....2....1....6....3....4....5....1....0....3...-1...-1....4....0....4....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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EXTENSIONS
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STATUS
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approved
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