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A013948 as a simple table

na(n)
12
23
36
48
59
611
712
815
918
1019
1121
1224
1326
1427
1530
1633
1735
1836
1938
2039
2142
2244
2345
2447
2550
2653
2754
2856
2957
3060
3162
3263
3365
3466
3569
3672
3774
3875
3977
4080
4181
4283
4384
4487
4589
4690
4792
4893
4996
5099
51100
52102
53105
54107
55108
56110
57111
58114
59117
60119
61120
62123
63126
64127
65129
66132
67135

[2,3,6,8,9,11,12,15,18,19,21,24,26,27,30,33,35,36,
 38,39,42,44,45,47,50,53,54,56,57,60,62,63,65,66,
 69,72,74,75,77,80,81,83,84,87,89,90,92,93,96,99,
 100,102,105,107,108,110,111,114,117,119,120,123,
 126,127,129,132,135]