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A209111 Number of n-bead necklaces labeled with numbers -4..4 not allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2. 0
1, 5, 19, 120, 741, 5032, 35253, 255821, 1898309, 14350653, 110094949, 855048115, 6709326541, 53110380781 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A209115.

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

Some solutions for n=6:

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

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

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

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

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

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

CROSSREFS

Sequence in context: A206709 A199480 A339079 * A328060 A297389 A228479

Adjacent sequences:  A209108 A209109 A209110 * A209112 A209113 A209114

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 05 2012

STATUS

approved

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Last modified January 16 04:59 EST 2022. Contains 350374 sequences. (Running on oeis4.)