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A028793 as a simple table

na(n)
12
23
35
46
57
68
710
811
912
1013
1114
1215
1317
1418
1519
1621
1722
1823
1924
2026
2127
2228
2329
2430
2531
2632
2733
2834
2935
3037
3138
3239
3340
3442
3543
3644
3745
3846
3947
4048
4150
4251
4352
4453
4554
4655
4756
4857
4958
5059
5160
5261
5362
5463
5566
5667
5768
5869
5970
6071
6172
6273
6374
6475
6576
6677
6778
6879

[2,3,5,6,7,8,10,11,12,13,14,15,17,18,19,21,22,23,
 24,26,27,28,29,30,31,32,33,34,35,37,38,39,40,42,
 43,44,45,46,47,48,50,51,52,53,54,55,56,57,58,59,
 60,61,62,63,66,67,68,69,70,71,72,73,74,75,76,77,
 78,79]