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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

Table of n, a(n) for n=1..16.

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

Adjacent sequences:  A208817 A208818 A208819 * A208821 A208822 A208823

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 01 2012

STATUS

approved

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Last modified August 12 19:39 EDT 2022. Contains 356077 sequences. (Running on oeis4.)