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A208820 Number of n-bead necklaces labeled with numbers -3..3 allowing reversal, with sum zero. 0
1, 4, 8, 38, 155, 828, 4390, 25202, 146803, 878708, 5330524, 32785934, 203687695, 1276913732, 8065359582, 51282069040 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 3 of A208825.
LINKS
EXAMPLE
All solutions for n=3:
.-2....0...-2...-3...-1...-3...-1...-2
.-1....0....1....1...-1....0....0....0
..3....0....1....2....2....3....1....2
CROSSREFS
Sequence in context: A098563 A231398 A231465 * A032301 A032213 A225824
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 01 2012
STATUS
approved

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Last modified April 13 14:38 EDT 2024. Contains 371643 sequences. (Running on oeis4.)