This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A305390 #13 Feb 06 2019 12:31:33 %S A305390 2,3,1,2,3,3,1,2,3,2,3,1,2,3,1,2,3,2,3,1,2,3,3,1,2,3,2,3,1,2,3,3,1,2, %T A305390 3,2,3,1,2,3,1,2,3,2,3,1,2,3,3,1,2,3,2,3,1,2,3,2,3,1,2,3,3,1,2,3,2,3, %U A305390 1,2,3,1,2,3,2,3,1,2,3,3,1,2,3,2,3,1,2,3,1,2,3,2,3 %N A305390 A ternary tribonacci sequence: define the morphism f: 1 -> 2, 2 -> 3, 3 -> 1,2,3; let S[k] be result of applying f k times to 1, for k =- 0,1,2,...; sequence gives limit S[3k+1] as k -> oo. %H A305390 N. J. A. Sloane, <a href="/A305390/b305390.txt">Table of n, a(n) for n = 0..25280</a> %Y A305390 The three sequence A305389, A305390, A305391 together give the limiting forms of the rows of A059832. %Y A305390 Used by A107793. %K A305390 nonn %O A305390 0,1 %A A305390 _N. J. A. Sloane_, Jun 21 2018