A209004 Number of n-bead necklaces labeled with numbers -5..5 not allowing reversal, with sum zero and first and second differences in -5..5.

1, 2, 3, 16, 71, 409, 2313, 13561, 77953, 448820, 2597203, 15189895, 89774431, 535825715

Offset

1,2

Comments

Column 5 of A209007.

Links

Table of n, a(n) for n=1..14.

Example

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

Crossrefs

Sequence in context: A355229 A052858 A191416 * A329121 A368765 A073997

Adjacent sequences: A209001 A209002 A209003 * A209005 A209006 A209007

Keyword

nonn

Author

R. H. Hardin, Mar 04 2012

Status

approved