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A208823 Number of n-bead necklaces labeled with numbers -6..6 allowing reversal, with sum zero. 0
1, 7, 25, 210, 1755, 17339, 177097, 1888153, 20587627, 228891069, 2582512649, 29499246456 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 6 of A208825.
LINKS
EXAMPLE
Some solutions for n=3:
.-4...-5...-4...-6...-5...-2...-1...-3...-6...-1...-3...-6...-4...-2...-6...-4
.-2....1....0....3...-1...-1....0...-1....1...-1....1....0...-1...-2....2....2
..6....4....4....3....6....3....1....4....5....2....2....6....5....4....4....2
CROSSREFS
Sequence in context: A088009 A293532 A356628 * A197913 A361777 A215058
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 01 2012
STATUS
approved

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Last modified April 13 05:03 EDT 2024. Contains 371639 sequences. (Running on oeis4.)