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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A305595 Number of length-n cyclic ternary words containing no abelian cubes. 0
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

Table of n, a(n) for n=1..11.

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: A143869 A165298 A117148 * A320687 A340494 A039567

Adjacent sequences:  A305592 A305593 A305594 * A305596 A305597 A305598

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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 23 18:45 EDT 2021. Contains 345402 sequences. (Running on oeis4.)