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A209342 Number of n-bead necklaces labeled with numbers -6..6 allowing reversal, with sum zero with no three beads in a row equal. 0
1, 7, 24, 205, 1724, 16968, 172610, 1830872, 19860306, 219630346, 2464760150, 28002352120 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 6 of A209344.

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=6:

.-5...-5...-5...-3...-6...-4...-6...-6...-6...-4...-4...-5...-5...-6...-5...-6

..0...-2....3....3....3...-2...-6....5....3...-3...-1...-2...-5...-1...-4....4

..2....1...-4...-3...-5....6....2...-6....5....1....1...-2....3....4....6...-5

.-3...-2....4....3....2...-4....3....5...-5....3....4....5....2....4....6....6

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

..4....5....4....3....3....1....5....5....4....3....0....2....5....2....2....6

CROSSREFS

Sequence in context: A198055 A012761 A209483 * A203117 A197791 A009652

Adjacent sequences:  A209339 A209340 A209341 * A209343 A209344 A209345

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 06 2012

STATUS

approved

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Last modified July 24 13:30 EDT 2021. Contains 346273 sequences. (Running on oeis4.)