A208811 Number of n-bead necklaces labeled with numbers -5..5 not allowing reversal, with sum zero and three times sum of squares <= n*(5)*(5+1).

1, 4, 19, 141, 1093, 8924, 77053, 692566, 6345907, 59150386, 562643309, 5397588986, 52466338007

Offset

1,2

Comments

Column 5 of A208814.

Links

Table of n, a(n) for n=1..13.

Example

Some solutions for n=6:
.-3...-2...-4...-3...-4...-3...-3...-4...-2...-4...-4...-4...-4...-3...-5...-4
.-3....1....0...-3....3....0....0....3....0....0...-2....3...-1...-3....4....1
..3...-1....5....2....0....5....1...-3...-1....0....0...-2...-3....2....3....0
..0....1....0....3....1...-1...-1....2...-1....3....4....0....1....0....1....2
.-1...-2....1....3....2...-3....1....0....1....1....4....2....5....1...-3....2
..4....3...-2...-2...-2....2....2....2....3....0...-2....1....2....3....0...-1

Crossrefs

Sequence in context: A259354 A215851 A197920 * A305725 A208992 A321388

Adjacent sequences: A208808 A208809 A208810 * A208812 A208813 A208814

Keyword

nonn

Author

R. H. Hardin, Mar 01 2012

Status

approved