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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A032321 Number of aperiodic necklaces with n labeled beads of 2 colors. 0
2, 2, 12, 72, 720, 6480, 90720, 1209600, 20321280, 359251200, 7424524800, 160465536000, 3923023104000, 101213996083200, 2853345470976000, 85364982743040000, 2742350070620160000, 93039294691639296000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..18.

C. G. Bower, Transforms (2)

Index entries for sequences related to Lyndon words

FORMULA

"CHJ" (necklace, identity, labeled) transform of 2, 0, 0, 0...

n! * A001037.

CROSSREFS

Sequence in context: A291541 A180072 A013315 * A013311 A303343 A087220

Adjacent sequences:  A032318 A032319 A032320 * A032322 A032323 A032324

KEYWORD

nonn

AUTHOR

Christian G. Bower

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 20 17:33 EDT 2018. Contains 316393 sequences. (Running on oeis4.)