OFFSET
0,2
LINKS
Rémy Sigrist, Table of n, a(n) for n = 0..15126
M. Dekking, Base phi representations and golden mean beta-expansions, arXiv:1906.08437 [math.NT], June 2019.
MATHEMATICA
Nest[Flatten[ReplaceAll[#, {1->{1, 2}, 2->3, 3->4, 4->{1, 2, 3}}]]&, {1}, 10] (* Paolo Xausa, Nov 09 2023 *)
PROG
(PARI) M = [[1, 2], [3], [4], [1, 2, 3]]; s = [1]; for (k=1, 100, while (k>#s, s=concat(apply(d -> M[d], s))); print1 (s[k] ", ")) \\ Rémy Sigrist, Jul 25 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jul 24 2019
STATUS
approved