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

 

Logo

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!)
A330258 Number of length-n squarefree ternary words having no occurrences of either 010 or 020. 2
1, 3, 6, 10, 14, 22, 26, 34, 38, 44, 48, 60, 64, 64, 74, 82, 86, 100, 110, 122, 134, 150, 142, 144, 146, 150, 166, 176, 182, 198, 212, 236, 252, 264, 282, 302, 288, 280, 274, 276, 292, 312, 314, 312, 332, 356, 380, 392, 404, 428, 456, 470, 478, 492, 508, 532 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

A. Thue. Über die gegenseitige Lage gleicher Teile gewisser Zeichenreihen. Norske vid. Selsk. Skr. Mat. Nat. Kl. 1 (1912), 1-67. Reprinted in Selected Mathematical Papers of Axel Thue, T. Nagell, editor, Universitetsforlaget, Oslo, 1977, pp. 413-478.

LINKS

Table of n, a(n) for n=0..55.

J. Berstel, Axel Thue's papers on repetitions in words: a translation, Publications du Laboratoire de Combinatoire et d'Informatique Mathématique, Vol. 20, Université du Québec à Montréal, February 1995.

CROSSREFS

Cf. A330257, A330259.

Sequence in context: A140949 A025206 A049989 * A197056 A104619 A194037

Adjacent sequences:  A330255 A330256 A330257 * A330259 A330260 A330261

KEYWORD

nonn

AUTHOR

Jeffrey Shallit, Dec 07 2019

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 December 2 18:11 EST 2021. Contains 349445 sequences. (Running on oeis4.)