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A222820 as a simple table

na(n)
21
32
42
53
63
73
85
94
103
116
125
134
147
157
164
178
186
198
208
217
226
2311
2411
256
268
279
286
2913
3012
3110
3213
336
349
3514
3610
379
3813
3917
409
4115
4212
4313
4417
4513
4611
4720
4816
4912
5012

[1,2,2,3,3,3,5,4,3,6,5,4,7,7,4,8,6,8,8,7,6,11,11,
 6,8,9,6,13,12,10,13,6,9,14,10,9,13,17,9,15,12,13,
 17,13,11,20,16,12,12]