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A113574 as a simple table

na(n)
11
212
3122
41224
512242
6122424
71224242
812242424
9122424244
101224242444
1112242424442
12122424244424
131224242444242
1412242424442424
15122424244424244
161224242444242444
1712242424442424442
18122424244424244424

[1,12,122,1224,12242,122424,1224242,12242424,
 122424244,1224242444,12242424442,122424244424,
 1224242444242,12242424442424,122424244424244,
 1224242444242444,12242424442424442,
 122424244424244424]