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A153848 as a simple table

na(n)
121
22121
3212121
421212121
52121212121
6212121212121
721212121212121
82121212121212121
9212121212121212121
1021212121212121212121
112121212121212121212121
12212121212121212121212121
1321212121212121212121212121
142121212121212121212121212121

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