|
| |
|
|
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
|
|
|
|
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
|
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
|
|
|
STATUS
|
approved
|
| |
|
|
