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A004157 as a simple table

na(n)
00
11
23
36
41
56
63
710
89
99
1010
1112
1215
1310
146
153
1610
179
189
1910
203
216
2210
2315
243
2510
269
2718
2810
2912
3015
3119
3215
3312
3419
359
3618
3710
3812
3915
4010
4115
4212
4319
4418
459
4610
4712
4815
4910
5015
5112
5219
539
5418
5510
5621
5715
5810
5915
6012
6119
6218
639
6410
6512
666
6719
6815
6912
7019
7118
7218
7310
7421
7515
7619
776
7812
7910

[0,1,3,6,1,6,3,10,9,9,10,12,15,10,6,3,10,9,9,10,3,
 6,10,15,3,10,9,18,10,12,15,19,15,12,19,9,18,10,12,
 15,10,15,12,19,18,9,10,12,15,10,15,12,19,9,18,10,
 21,15,10,15,12,19,18,9,10,12,6,19,15,12,19,18,18,
 10,21,15,19,6,12,10]