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A028812 as a simple table

na(n)
12
23
35
46
57
68
710
811
912
1013
1114
1215
1317
1418
1519
1620
1721
1823
1924
2026
2128
2229
2330
2432
2533
2635
2738
2839
2940
3041
3142
3243
3344
3446
3547
3648
3750
3851
3952
4053
4154
4256
4357
4459
4560
4661
4762
4863
4965
5066
5168
5269
5371
5472
5573
5674
5775
5876
5977
6078
6179
6280
6383
6484
6585
6686
6787
6889
6990
7092
7193
7294
7395
7496
7598

[2,3,5,6,7,8,10,11,12,13,14,15,17,18,19,20,21,23,
 24,26,28,29,30,32,33,35,38,39,40,41,42,43,44,46,
 47,48,50,51,52,53,54,56,57,59,60,61,62,63,65,66,
 68,69,71,72,73,74,75,76,77,78,79,80,83,84,85,86,
 87,89,90,92,93,94,95,96,98]