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The Tower of Hanoi word, with a,b,c,a-bar,b-bar,c-bar encoded as 1,2,3,-1,-2,-3 respectively.
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%I #10 Jan 10 2017 08:07:14

%S 1,-3,2,1,3,-2,1,-3,2,-1,3,2,1,-3,2,1,3,-2,1,3,2,-1,3,-2,1,-3,2,1,3,

%T -2,1,-3,2,-1,3,2,1,-3,2,-1,3,-2,1,3,2,-1,3,2,1,-3,2,1,3,-2,1,-3,2,-1,

%U 3,2,1,-3,2,1,3,-2,1,3,2,-1,3,-2,1,-3,2,1,3,-2

%N The Tower of Hanoi word, with a,b,c,a-bar,b-bar,c-bar encoded as 1,2,3,-1,-2,-3 respectively.

%C Writing A,B,C for a-bar,b-bar,c-bar, respectively, the word is aCbacBaCbAcbaCbacBacbAcBaCbacBaCbAcbaCbAcBacbAcbaCbacBaCbAcbaCbacBacbAcBaCbacB...

%H Lars Blomberg, <a href="/A280048/b280048.txt">Table of n, a(n) for n = 0..10000</a>

%H J. Berstel et al., <a href="http://bookstore.ams.org/crmm-27">Combinatorics on Words: Christoffel Words and Repetitions in Words</a>, AMS, 2009; see Definition 2.29, page 92.

%K sign

%O 0,2

%A _N. J. A. Sloane_, Dec 31 2016

%E More terms from _Lars Blomberg_, Jan 09 2017