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A028974 as a simple table

na(n)
10
23
34
45
56
68
79
810
911
1012
1113
1215
1316
1418
1519
1620
1721
1823
1924
2025
2126
2227
2329
2430
2531
2632
2733
2834
2935
3036
3137
3238
3339
3440
3541
3642
3743
3844
3945
4046
4147
4248
4350
4451
4552
4654
4755
4857
4958
5059
5160
5261
5362
5464
5565
5666
5767
5868
5969
6070
6171
6272
6373
6474
6575
6676
6778
6879

[0,3,4,5,6,8,9,10,11,12,13,15,16,18,19,20,21,23,
 24,25,26,27,29,30,31,32,33,34,35,36,37,38,39,40,
 41,42,43,44,45,46,47,48,50,51,52,54,55,57,58,59,
 60,61,62,64,65,66,67,68,69,70,71,72,73,74,75,76,
 78,79]