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A172054 as a simple table

na(n)
12
23
34
42
56
67
75
87
98
107
119
1212
1312
1412
159
164
176
184
198
209
217
228
2312
2411
2514
2617
2717
2812
2918
3017
3119
3213
3313
3410
3511
369
378
387
3915
4017
4118
4213
4312
4413
4513
4611
4711
4815
4919
5019
5123
5223
5319
5412
5516
5617
5712
5811
5918
6022
6127
6229
6327
6427
6525
6618
6727
6828
6923
7022
7123
7217
7321
7424
7523
7623
7730

[2,3,4,2,6,7,5,7,8,7,9,12,12,12,9,4,6,4,8,9,7,8,
 12,11,14,17,17,12,18,17,19,13,13,10,11,9,8,7,15,
 17,18,13,12,13,13,11,11,15,19,19,23,23,19,12,16,
 17,12,11,18,22,27,29,27,27,25,18,27,28,23,22,23,
 17,21,24,23,23,30]