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

%I

%S 3,6,8,15,30,67,126,261,540,1101,2442

%N Number of length-n cyclic ternary words containing no abelian cubes.

%C Two words are considered identical in the cyclic sense if one is a cyclic shift of the other.

%C An abelian cube is a word of the form x x' x'' where x' and x'' are permutations of x.

%e 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}.

%K nonn,more

%O 1,1

%A _Jeffrey Shallit_, Jun 05 2018

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 May 16 06:54 EDT 2021. Contains 343939 sequences. (Running on oeis4.)