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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.

A317953 Apply the morphism 1 -> {1, 2}, 2 -> {3,1}, 3 -> {1} n times to 1, and concatenate the resulting string.

Table of values

n a(n)
1 1
2 12
3 1231
4 1231112
5 1231112121231
6 123111212123112311231112
7 12311121212311231123111212311121231112121231
8 123111212123112311231112123111212311121212311231112121231123111212123112311231112

List of values

[1, 12, 1231, 1231112, 1231112121231, 123111212123112311231112, 12311121212311231123111212311121231112121231, 123111212123112311231112123111212311121212311231112121231123111212123112311231112]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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