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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A209336 Number of n-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero with no three beads in a row equal. 0
 1, 3, 7, 72, 883, 16968, 409199, 12099880, 420661470, 16838275108, 762821788869 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A209344. LINKS EXAMPLE Some solutions for n=6: .-4...-5...-6...-4...-6...-5...-5...-5...-5...-5...-3...-5...-5...-6...-6...-5 .-3...-4....5....2...-4....3....3....0...-4....0...-2...-3....1...-3....0....0 ..6....5...-4....3....6...-3...-1....2...-4...-3...-1....1....2....2....3....0 ..0....0...-5...-3....3....0...-3...-2....6....3....0...-2...-4....1....3...-1 ..0....2....4...-1....1....1....2...-1....4....0....5....5....0....0...-4....1 ..1....2....6....3....0....4....4....6....3....5....1....4....6....6....4....5 CROSSREFS Sequence in context: A128072 A094008 A209477 * A078552 A091259 A354891 Adjacent sequences:  A209333 A209334 A209335 * A209337 A209338 A209339 KEYWORD nonn AUTHOR R. H. Hardin, Mar 06 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.

Last modified June 29 05:44 EDT 2022. Contains 354910 sequences. (Running on oeis4.)