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A153848 as a simple table

n a(n)
1 21
2 2121
3 212121
4 21212121
5 2121212121
6 212121212121
7 21212121212121
8 2121212121212121
9 212121212121212121
10 21212121212121212121
11 2121212121212121212121
12 212121212121212121212121
13 21212121212121212121212121
14 2121212121212121212121212121

[21,2121,212121,21212121,2121212121,212121212121,
 21212121212121,2121212121212121,
 212121212121212121,21212121212121212121,
 2121212121212121212121,212121212121212121212121,
 21212121212121212121212121,
 2121212121212121212121212121]

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Last modified October 26 13:09 EDT 2021. Contains 348267 sequences. (Running on oeis4.)