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 A103269 Apply the tribonacci morphism 1 -> {1, 2}, 2 -> {1, 3}, 3 -> {1} n times to 1, and concatenate the resulting string. 7
 1, 12, 1213, 1213121, 1213121121312, 121312112131212131211213, 12131211213121213121121312131211213121213121, 121312112131212131211213121312112131212131211213121121312121312112131213121121312 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS The number of letters in the n-th iteration is tribonacci(n+3) (that is, A000073(n+3)). LINKS N. J. A. Sloane, Table of n, a(n) for n = 0..10 (shortened by N. J. A. Sloane, Jan 18 2019) Elena Barcucci, Luc Belanger and Srecko Brlek, On tribonacci sequences, Fib. Q., 42 (2004), 314-320. See T on page 315. Julien Cassaigne, Sebastien Ferenczi, and Luca Q. Zamboni, Imbalances in Arnoux-Rauzy sequences, Annales de l'institut Fourier, 50 (2000), 1265-1276. David Damanik and Luca Q. Zamboni, Arnoux-Rauzy Subshifts: Linear Recurrence, Powers and Palindromes, arXiv:math/0208137 [math.CO], 2002. C. Holton and L. Q. Zamboni, Directed Graphs and Substitutions, Theory Comput. Systems, 34 (2001) 545-564 S. Ito and M. Kimura, On Rauzy fractal, Japan J. Indust. Appl. Math. 8 (1991) 461-486. A. Messaoudi, Propriétes arithmétiques et dynamiques du fractal de Rauzy, J. Th. Nombres Bordeaux, 10 (1998) 195-224. Gérard Rauzy, Nombres algébriques et substitutions, Bull. Soc. Math. France, 110 (1982), 147-178. Bo Tan and Zhi-Ying Wen, Some properties of the Tribonacci sequence, European Journal of Combinatorics, 28 (2007) 1703-1719. See A_n. MATHEMATICA FromDigits /@ NestList[ Flatten[ # /. {1 -> {1, 2}, 2 -> {1, 3}, 3 -> 1}] &, {1}, 7] (* Second program: *) FromDigits /@ SubstitutionSystem[{1 -> {1, 2}, 2 -> {1, 3}, 3 -> {1}}, {1}, 7] (* Jean-François Alcover, Nov 12 2018 *) CROSSREFS A092782 is limit of these strings. Cf. A000073, A106748, A106749, A003842, A106750, A092782, A317196. Sequence in context: A178529 A201642 A177090 * A317955 A033564 A301474 Adjacent sequences: A103266 A103267 A103268 * A103270 A103271 A103272 KEYWORD nonn AUTHOR Jonathan Vos Post and Robert G. Wilson v, May 16 2005 EXTENSIONS Definition edited by N. J. A. Sloane, Aug 06 2018 STATUS approved

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Last modified December 1 12:40 EST 2022. Contains 358468 sequences. (Running on oeis4.)