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A006047 as a simple table

na(n)
01
12
23
32
44
56
63
76
89
92
104
116
124
138
1412
156
1612
1718
183
196
209
216
2212
2318
249
2518
2627
272
284
296
304
318
3212
336
3412
3518
364
378
3812
398
4016
4124
4212
4324
4436
456
4612
4718
4812
4924
5036
5118
5236
5354
543
556
569
576
5812
5918
609
6118
6227
636
6412
6518
6612
6724
6836
6918
7036
7154
729
7318
7427
7518
7636
7754
7827
7954

[1,2,3,2,4,6,3,6,9,2,4,6,4,8,12,6,12,18,3,6,9,6,
 12,18,9,18,27,2,4,6,4,8,12,6,12,18,4,8,12,8,16,24,
 12,24,36,6,12,18,12,24,36,18,36,54,3,6,9,6,12,18,
 9,18,27,6,12,18,12,24,36,18,36,54,9,18,27,18,36,
 54,27,54]