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A140828 as a simple table

na(n)
01
12
22
33
43
54
64
75
84
96
105
117
126
137
147
157
168
178
188
199
208
2110
228
2311
249
2511
2610
2711
2810
2911
3011
3112
3211
3313
3411
3514
3611
3715
3811
3916
4011
4117
4211
4318
4411
4518
4612
4718
4813
4918
5013
5118
5214
5318
5414
5519
5614
5720
5814
5920
6015
6119
6216
6320
6416
6520
6616
6721
6817
6921
7017
7121
7218
7321
7418
7522
7618

[1,2,2,3,3,4,4,5,4,6,5,7,6,7,7,7,8,8,8,9,8,10,8,
 11,9,11,10,11,10,11,11,12,11,13,11,14,11,15,11,16,
 11,17,11,18,11,18,12,18,13,18,13,18,14,18,14,19,
 14,20,14,20,15,19,16,20,16,20,16,21,17,21,17,21,
 18,21,18,22,18]