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A208817
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Number of n-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero.
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0
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1, 3, 8, 75, 905, 17339, 417204, 12322101, 427919519, 17112239947, 774546254686
(list;
graph;
refs;
listen;
history;
text;
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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All solutions for n=3:
.-2....0...-3...-3...-2...-1...-2...-1
.-1....0....0....1....0...-1....1....0
..3....0....3....2....2....2....1....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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