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A208941 Number of n-bead necklaces labeled with numbers -4..4 not allowing reversal, with sum zero with no three beads in a row equal. 0
1, 5, 20, 122, 766, 5238, 37044, 270832, 2024738, 15417296, 119124324, 931714740, 7362145488, 58683599062, 471302764880 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A208945.

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Some solutions for n=5:

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

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

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

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

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

CROSSREFS

Sequence in context: A028944 A332710 A054720 * A209069 A301952 A110373

Adjacent sequences:  A208938 A208939 A208940 * A208942 A208943 A208944

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 03 2012

STATUS

approved

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Last modified December 4 12:10 EST 2021. Contains 349490 sequences. (Running on oeis4.)