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A187831 as a simple table

na(n)
01
12
23
36
45
56
612
79
89
918
1011
1114
1224
1314
1418
1530
1617
1718
1836
1925
2022
2142
2225
2327
2448
2533
2628
2754
2836
2933
3060
3141
3242
3366
3436
3541
3672
3743
3839
3978
4041
4154
4284
4357
4450
4590
4647
4754
4896
4957
5066
51102
5256
5354
54108
5573
5657
57114
5859
5978
60120
6162
6282
63126
6475

[1,2,3,6,5,6,12,9,9,18,11,14,24,14,18,30,17,18,36,
 25,22,42,25,27,48,33,28,54,36,33,60,41,42,66,36,
 41,72,43,39,78,41,54,84,57,50,90,47,54,96,57,66,
 102,56,54,108,73,57,114,59,78,120,62,82,126,75]