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A160943 as a simple table

na(n)
13
26
39
412
515
618
721
824
918
1021
1115
1218
1321
1424
1527
1630
1733
1836
1930
2033
2127
2230
2333
2436
2539
2642
2745
2848
2942
3045
3139
3242
3345
3448
3551
3654
3757
3860
3954
4057
4151
4254
4357
4460
4563
4666
4769
4872
4966
5069
5163
5266
5369
5472
5575
5678
5781
5884
5978
6081
6175
6278
6381
6484
6587
6690
6793
6896
6990
7093

[3,6,9,12,15,18,21,24,18,21,15,18,21,24,27,30,33,
 36,30,33,27,30,33,36,39,42,45,48,42,45,39,42,45,
 48,51,54,57,60,54,57,51,54,57,60,63,66,69,72,66,
 69,63,66,69,72,75,78,81,84,78,81,75,78,81,84,87,
 90,93,96,90,93]