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A209341 Number of n-bead necklaces labeled with numbers -5..5 allowing reversal, with sum zero with no three beads in a row equal. 0
1, 6, 17, 128, 883, 7358, 62853, 563109, 5153746, 48127107, 456011561, 4374662802, 42398844001 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 5 of A209344.

LINKS

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

EXAMPLE

Some solutions for n=7:

.-4...-5...-5...-5...-3...-3...-5...-4...-3...-5...-3...-4...-4...-5...-4...-3

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

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

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

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

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

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

CROSSREFS

Sequence in context: A024080 A099436 A209482 * A077022 A074923 A093061

Adjacent sequences:  A209338 A209339 A209340 * A209342 A209343 A209344

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 06 2012

STATUS

approved

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Last modified September 19 15:37 EDT 2021. Contains 347564 sequences. (Running on oeis4.)