login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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
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: A332710 A352743 A054720 * A209069 A301952 A110373
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 03 2012
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 24 14:32 EDT 2024. Contains 371960 sequences. (Running on oeis4.)