login
The OEIS is supported by the many generous donors to the OEIS Foundation.
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A208985
Number of n-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero and first differences in -n..n.
0
1, 2, 5, 33, 351, 5404, 104001, 2416967, 65820325, 2058166065, 72731671225
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Diagonal of A208993.
LINKS
Table of n, a(n) for n=1..11.
EXAMPLE
Some solutions for n=6:
.-3...-5...-3...-4...-5...-5...-4...-3...-4...-1...-5...-4...-3...-4...-5...-3
.-3....1....2....1...-5....1....2....0....1...-1....0....2....1...-1....0...-1
..2...-1....1...-1...-1....5....2...-2...-2...-1....5...-1....2....2...-1....0
..0....2...-2....3....4....2...-2....1....3....3....0....3....0...-1....5....6
..5....3....1....1....6....1....3....1....4....0....2....3....0....2....0....0
.-1....0....1....0....1...-4...-1....3...-2....0...-2...-3....0....2....1...-2
CROSSREFS
Sequence in context: A198089 A366327 A197974 * A333738 A114793 A254429
Adjacent sequences: A208982 A208983 A208984 * A208986 A208987 A208988
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 04 2012
STATUS
approved

Lookup Welcome Wiki Register Music Plot 2 Demos Index WebCam Contribute Format Style Sheet Transforms Superseeker Recents
The OEIS Community
Maintained by The OEIS Foundation Inc.
Last modified November 16 10:34 EST 2024. Contains 377791 sequences.
License Agreements, Terms of Use, Privacy Policy