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A031213 as a simple table

na(n)
01
11
217
3123
417
517
6123
7123
8123
9123
101
1117
12123
1317
14123
15123
16123
1781
1881
19123
2017
21123
22123
23123
24123
25123
26123
27123
28123
29123
30123
3117
32123
33123
34123
35123
36123
3781
3817
39123
4017
41123
42123
43123
44123
45123
467
47123
48123
49123
5017
51123
52123
53123
54123

[1,1,17,123,17,17,123,123,123,123,1,17,123,17,123,
 123,123,81,81,123,17,123,123,123,123,123,123,123,
 123,123,123,17,123,123,123,123,123,81,17,123,17,
 123,123,123,123,123,7,123,123,123,17,123,123,123,
 123]