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%I #9 Aug 05 2018 13:50:25
%S 12,213,3121,121312,2131211213
%N Bo Tan et al.'s string E_n, defined by A_n = A103269(n) = D_{n-1}E_n = A317197(n-1)E_n for n >= 2, with E_1 = 12.
%C See A317200 for length of E_n.
%H Bo Tan and Zhi-Ying Wen, <a href="http://dx.doi.org/10.1016/j.ejc.2006.07.007">Some properties of the Tribonacci sequence</a>, European Journal of Combinatorics, 28 (2007) 1703-1719. See E_n, p. 1706.
%e A_4 = 1213121121312, D_3 = 1213121, so E_4 = 121312.
%Y Cf. A103269, A317197, A317200.
%Y See A317201 for the reversals of these words.
%K nonn,more
%O 1,1
%A _N. J. A. Sloane_, Aug 05 2018
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