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 A106826 Trajectory of 1 under the morphism 1->{2,1}, 2->{2,3}, 3->{4,3}, 4->{4,1}. 1
 2, 3, 4, 3, 4, 1, 4, 3, 4, 1, 2, 1, 4, 1, 4, 3, 4, 1, 2, 1, 2, 3, 2, 1, 4, 1, 2, 1, 4, 1, 4, 3, 4, 1, 2, 1, 2, 3, 2, 1, 2, 3, 4, 3, 2, 3, 2, 1, 4, 1, 2, 1, 2, 3, 2, 1, 4, 1, 2, 1, 4, 1, 4, 3, 4, 1, 2, 1, 2, 3, 2, 1, 2, 3, 4, 3, 2, 3, 2, 1, 2, 3, 4, 3, 4, 1, 4, 3, 2, 3, 4, 3, 2, 3, 2, 1, 4, 1, 2, 1, 2, 3, 2, 1, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS This is the reverse of the morphism in A105500 and the trajectory of 1 actually starts with 2 instead of 1. LINKS F. M. Dekking, Recurrent sets, Advances in Mathematics, vol. 44, no. 1 (1982), 78-104. MATHEMATICA Nest[ Flatten[ # /. {1 -> {2, 1}, 2 -> {2, 3}, 3 -> {4, 3}, 4 -> {4, 1}}] &, {1}, 8] (*Robert G. Wilson v, Jun 20 2005 *) PROG (PARI) {a(n)=local(A); if(n<0, 0, n++; A=[2]; while(length(A)

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Last modified June 15 20:50 EDT 2019. Contains 324145 sequences. (Running on oeis4.)