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A028797 as a simple table

na(n)
12
23
35
46
57
68
710
811
912
1013
1114
1215
1317
1418
1519
1620
1722
1823
1924
2026
2127
2229
2330
2431
2532
2633
2734
2835
2938
3039
3140
3241
3342
3443
3544
3645
3746
3847
3948
4050
4151
4252
4353
4454
4555
4656
4758
4859
4961
5062
5163
5265
5366
5467
5568
5669
5770
5871
5973
6074
6175
6276
6377
6478
6579
6680
6782
6883

[2,3,5,6,7,8,10,11,12,13,14,15,17,18,19,20,22,23,
 24,26,27,29,30,31,32,33,34,35,38,39,40,41,42,43,
 44,45,46,47,48,50,51,52,53,54,55,56,58,59,61,62,
 63,65,66,67,68,69,70,71,73,74,75,76,77,78,79,80,
 82,83]