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

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A305595 Number of length-n cyclic ternary words containing no abelian cubes. 1
3, 6, 8, 15, 30, 67, 126, 261, 540, 1101, 2442 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Two words are considered identical in the cyclic sense if one is a cyclic shift of the other.
An abelian cube is a word of the form x x' x'' where x' and x'' are permutations of x.
LINKS
EXAMPLE
For n = 4 the a(4) = 15 such words are {0011, 0012, 0021, 0022, 0101, 0102, 0112, 0121, 0122, 0202, 0211, 0212, 0221, 1122, 1212}.
CROSSREFS
Sequence in context: A352507 A117148 A343272 * A320687 A340494 A039567
KEYWORD
nonn,more
AUTHOR
Jeffrey Shallit, Jun 05 2018
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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 29 09:59 EDT 2024. Contains 371268 sequences. (Running on oeis4.)