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A209482 Number of n-bead necklaces labeled with numbers -5..5 allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2. 0
1, 6, 17, 128, 866, 7179, 60778, 541494, 4926728, 45758958, 431242307, 4115192739 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 5 of A209485.

LINKS

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

EXAMPLE

Some solutions for n=7:

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A130278 A024080 A099436 * A209341 A077022 A074923

Adjacent sequences:  A209479 A209480 A209481 * A209483 A209484 A209485

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 09 2012

STATUS

approved

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Last modified October 22 07:06 EDT 2021. Contains 348160 sequences. (Running on oeis4.)