A208990 - OEIS

A208990

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

1, 3, 11, 58, 351, 2354, 16307, 116183, 843779, 6227718, 46571177, 352155364, 2688196663, 20688930990, 160363122189

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Column 5 of A208993.

LINKS

EXAMPLE

Some solutions for n=6:

.-2...-4...-2...-4...-2...-4...-3...-4...-3...-3...-4...-2...-2...-3...-2...-4

..0...-3...-1....1...-2...-2....1...-2....2....2....1...-2...-2....2....0...-4

..0....1...-1....3....2...-1....2....3....3....0...-1...-1...-1....3....2....0

..3....3...-1....2....0....3...-1....3...-1....0....3....3....4....0...-2....3

.-1....3....2....0....0....4....3....2...-1....3....2....0....2...-2....0....5

..0....0....3...-2....2....0...-2...-2....0...-2...-1....2...-1....0....2....0

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 04 2012

STATUS

approved