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 A054351 Successive generations of the Kolakoski sequence A000002. 11
 1, 12, 1221, 1221121, 12211212212, 122112122122112112, 1221121221221121122121121221, 1221121221221121122121121221121121221221121, 12211212212211211221211212211211212212211212212112112212211212212 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS PROG (Python) from itertools import accumulate, groupby, repeat def K(n, _): c, s = "12", "" for i, k in enumerate(str(n)): s += c[i%2]*int(k) return int(s + c[(i+1)%2]) def aupton(nn): return list(accumulate(repeat(1, nn+1), K)) print(aupton(8)) # Michael S. Branicky, Jan 12 2021 CROSSREFS Cf. A054348, A054349, A054350, A054352, A042942, A000002. Word lengths give A054352. Sequence in context: A317955 A033564 A301474 * A080814 A340834 A078294 Adjacent sequences: A054348 A054349 A054350 * A054352 A054353 A054354 KEYWORD nonn,easy AUTHOR N. J. A. Sloane, May 07 2000 EXTENSIONS More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 05 2003 STATUS approved

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Last modified November 29 08:40 EST 2022. Contains 358422 sequences. (Running on oeis4.)