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A037729 as a simple table

na(n)
12
220
3203
42031
520312
6203120
72031203
820312031
9203120312
102031203120
1120312031203
12203120312031
132031203120312
1420312031203120
15203120312031203
162031203120312031

[2,20,203,2031,20312,203120,2031203,20312031,
 203120312,2031203120,20312031203,203120312031,
 2031203120312,20312031203120,203120312031203,
 2031203120312031]