The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A209112 Number of n-bead necklaces labeled with numbers -5..5 not allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2. 0
 1, 6, 29, 221, 1683, 14037, 121117, 1079992, 9849223, 91488850, 862442967, 8230097726, 79348933361 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 5 of A209115. LINKS EXAMPLE Some solutions for n=6: .-5...-4...-4...-5...-4...-4...-5...-2...-4...-4...-4...-4...-3...-3...-4...-5 .-5....0....1....4....0....5...-1....1....0....0...-3....3....1...-2....3....4 ..2....0....3...-2...-2....2....4...-2...-3....1....4....3...-1....3...-2...-2 ..2....3....1....0....2....2....1....1....0...-1....4...-2....5....1...-2....2 ..1....3....1....0....3...-3....4...-1....2....5....0...-3...-2....0....1....0 ..5...-2...-2....3....1...-2...-3....3....5...-1...-1....3....0....1....4....1 CROSSREFS Sequence in context: A020036 A294312 A054748 * A205811 A143563 A266205 Adjacent sequences:  A209109 A209110 A209111 * A209113 A209114 A209115 KEYWORD nonn AUTHOR R. H. Hardin, Mar 05 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
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified November 30 06:28 EST 2021. Contains 349419 sequences. (Running on oeis4.)