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A105265 Concatenation of letters of words obtained from axiom "1" and the iterates of the substitutions '1' -> "12", '2' -> "3", '3' -> "4", '4' -> "1". 1
1, 1, 2, 1, 2, 1, 2, 3, 1, 2, 1, 2, 3, 1, 2, 3, 1, 2, 3, 4, 1, 2, 1, 2, 3, 1, 2, 3, 1, 2, 3, 4, 1, 2, 3, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 1, 2, 1, 2, 3, 1, 2, 3, 1, 2, 3, 4, 1, 2, 3, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 1, 2, 3, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 1, 2, 3, 4, 1, 2, 3, 4, 1, 1, 2, 3, 4 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Let W() be the substitution defined above. If we define the sequence S(n) by S(0) = {1}, S(n+1) = S(n) + W(S(n)), then this sequence is the limiting sequence of S(n) as n approaches infinity. - Charlie Neder, Jul 11 2018

LINKS

Charlie Neder, Table of n, a(n) for n = 0..9999

MATHEMATICA

s[1] = {1, 2}; s[2] = {3}; s[3] = {4}; s[4] = {1};

t[a_] := Join[a, Flatten[s /@ a]];

p[0] = {1}; p[1] = t[{1}]; p[n_] := t[p[n - 1]]

aa = p[6]

CROSSREFS

Cf. A073058.

Sequence in context: A290532 A080237 A136109 * A351468 A193360 A061394

Adjacent sequences: A105262 A105263 A105264 * A105266 A105267 A105268

KEYWORD

nonn,easy,less

AUTHOR

Roger L. Bagula, Apr 15 2005

EXTENSIONS

New name from Joerg Arndt, Jul 14 2018

STATUS

approved

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Last modified December 7 10:26 EST 2022. Contains 358656 sequences. (Running on oeis4.)