login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A208813 Number of n-bead necklaces labeled with numbers -7..7 not allowing reversal, with sum zero and three times sum of squares <= n*(7)*(7+1). 0
1, 5, 37, 355, 3595, 41962, 486633, 5896400, 75009913, 947911584, 12153660815, 161974729738 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 7 of A208814.

LINKS

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

EXAMPLE

Some solutions for n=6:

.-6...-5...-6...-4...-7...-4...-4...-5...-6...-4...-4...-3...-6...-3...-4...-4

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

..4...-4....5...-3....6....4...-1....7....2....5...-1...-1....0....2....1....2

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

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

..5....1....4....0...-2....1...-1....3....0....1....2....7....0....0....2....0

CROSSREFS

Sequence in context: A197713 A004208 A198077 * A112698 A234953 A025168

Adjacent sequences:  A208810 A208811 A208812 * A208814 A208815 A208816

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 01 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 | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 19 00:36 EDT 2018. Contains 316327 sequences. (Running on oeis4.)