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A147301 as a simple table

na(n)
21
31
41
52
61
72
83
92
103
115
125
136
143
152
165
177
187
196
207
2110
227
2310
2411
2511
2611
2713
2813
2914
3013
3114
3215
3314
3415
3513
3617
3715
3817
3917
4019
4119
4219
4321
4421
4522
4617
4721
4819
4923
5021
5122
5223
5323
5423
5526
5623
5726
5823
5929
6029
6130
6229
6329
6431
6531
6631
6733
6833
6934
7033
7134
7235
7335
7435
7537
7637
7738

[1,1,1,2,1,2,3,2,3,5,5,6,3,2,5,7,7,6,7,10,7,10,11,
 11,11,13,13,14,13,14,15,14,15,13,17,15,17,17,19,
 19,19,21,21,22,17,21,19,23,21,22,23,23,23,26,23,
 26,23,29,29,30,29,29,31,31,31,33,33,34,33,34,35,
 35,35,37,37,38]