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A317954 Fixed point of the morphism 1 -> 12, 2 -> 13, 3 -> 14, 4 -> 1, starting from a(1) = 1. 2
1, 2, 1, 3, 1, 2, 1, 4, 1, 2, 1, 3, 1, 2, 1, 1, 2, 1, 3, 1, 2, 1, 4, 1, 2, 1, 3, 1, 2, 1, 2, 1, 3, 1, 2, 1, 4, 1, 2, 1, 3, 1, 2, 1, 1, 2, 1, 3, 1, 2, 1, 4, 1, 2, 1, 3, 1, 2, 1, 3, 1, 2, 1, 4, 1, 2, 1, 3, 1, 2, 1, 1, 2, 1, 3, 1, 2, 1, 4, 1, 2, 1, 3, 1, 2, 1, 2, 1, 3, 1, 2, 1, 4, 1, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

MAPLE

A:= [1]:

for n from 1 while nops(A) < 1000 do

  A:= subs([1=(1, 2), 2=(1, 3), 3=(1, 4), 4=1], A)

od:

A; # Robert Israel, Aug 21 2018

MATHEMATICA

Nest[Flatten[#/.{0 -> {0, 1}, 1 -> {1, 2}, 2 -> {2, 0}}] &, {0}, 7] (* G. C. Greubel, Jan 02 2019 *)

CROSSREFS

Cf. A003849, A092782, A100619, A317955.

Sequence in context: A156249 A187808 A317673 * A164677 A001511 A265331

Adjacent sequences:  A317951 A317952 A317953 * A317955 A317956 A317957

KEYWORD

nonn

AUTHOR

N. J. A. Sloane and Doron Zeilberger, Aug 21 2018

STATUS

approved

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Last modified July 5 00:40 EDT 2020. Contains 335457 sequences. (Running on oeis4.)