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A286421 as a simple table

na(n)
12
23
34
45
56
69
711
812
913
1014
1116
1217
1320
1421
1522
1623
1724
1827
1929
2030
2133
2234
2335
2436
2538
2639
2740
2841
2942
3045
3147
3248
3349
3450
3552
3653
3756
3857
3958
4059
4161
4262
4363
4464
4565
4668
4770
4871
4974
5075
5176
5277
5378
5481
5583
5684
5785
5886
5988
6089
6192
6293
6394
6495
6596
6699

[2,3,4,5,6,9,11,12,13,14,16,17,20,21,22,23,24,27,
 29,30,33,34,35,36,38,39,40,41,42,45,47,48,49,50,
 52,53,56,57,58,59,61,62,63,64,65,68,70,71,74,75,
 76,77,78,81,83,84,85,86,88,89,92,93,94,95,96,99]