%I #5 Feb 12 2021 12:14:03
%S 21,312,1213,213121,3121121312
%N Reverse of A317199(n).
%C With a different offset, this is F_n in Bo Tan et al., pp. 1706ff.
%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 Prop. 2.8.
%Y Cf. A317199.
%K nonn,more
%O 1,1
%A _N. J. A. Sloane_, Aug 05 2018