|
|
A209029
|
|
Number of n-bead necklaces labeled with numbers -5..5 allowing reversal, with sum zero and first differences in -5..5.
|
|
1
|
|
|
1, 3, 7, 38, 187, 1237, 8235, 58524, 422504, 3117158, 23290361, 176103500, 1344136056, 10344670554, 80181862705, 625395356182, 4904914026691, 38658468142298, 306034794302017, 2432316965565820, 19401236375176220, 155259190622702818
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
LINKS
|
|
|
EXAMPLE
|
Some solutions for n=6:
.-4...-3...-2...-3...-3...-3...-3...-3...-3...-3...-3...-3...-2...-2...-2...-3
.-1....0...-1....0...-2....1....0...-2....1...-2...-2...-3....0....1....0...-2
..0....1....0....0....1....2....3....2...-3....2....2...-2....1...-1....1....1
..0....0....3....0....4...-2....0...-1....1....2....1....1....2....1....1....1
..4....2...-1....1...-1....0...-2....2....2....3....0....5...-2....0...-2....3
..1....0....1....2....1....2....2....2....2...-2....2....2....1....1....2....0
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|