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A208822 Number of n-bead necklaces labeled with numbers -5..5 allowing reversal, with sum zero. 0
1, 6, 18, 131, 905, 7582, 65134, 587682, 5416897, 50959134, 486441796, 4701644087, 45911470685 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 5 of A208825.
LINKS
EXAMPLE
Some solutions for n=3:
.-2...-2...-2...-3...-5...-3...-2...-5...-4...-4....0...-4...-3...-1...-4...-5
..0...-2...-1....0....2...-1....1....1...-1....0....0....2...-2...-1....1....0
..2....4....3....3....3....4....1....4....5....4....0....2....5....2....3....5
CROSSREFS
Cf. A208825.
Sequence in context: A125839 A117813 A012758 * A003496 A009582 A222913
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 01 2012
STATUS
approved

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Last modified February 26 17:57 EST 2024. Contains 370352 sequences. (Running on oeis4.)