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A330259 Number of length-n ternary squarefree strings having no occurrences of either 010 or 101. 2
1, 3, 6, 10, 14, 20, 22, 28, 30, 36, 42, 48, 54, 62, 70, 84, 78, 82, 88, 96, 104, 112, 128, 142, 148, 168, 158, 152, 158, 170, 174, 178, 194, 210, 220, 234, 254, 264, 274, 292, 280, 282, 292, 304, 290, 296, 310, 322, 326, 340, 354, 362, 370, 384, 400, 402, 424 (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..56.

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, A330258.

Sequence in context: A338335 A226185 A310071 * A024928 A330257 A079552

Adjacent sequences:  A330256 A330257 A330258 * A330260 A330261 A330262

KEYWORD

nonn

AUTHOR

Jeffrey Shallit, Dec 07 2019

STATUS

approved

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Last modified January 26 07:34 EST 2022. Contains 350577 sequences. (Running on oeis4.)