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A284676 as a simple table

na(n)
12
23
34
45
57
68
79
811
912
1013
1115
1216
1317
1418
1520
1621
1722
1824
1925
2026
2128
2229
2330
2431
2533
2634
2735
2837
2938
3039
3141
3242
3343
3444
3546
3647
3748
3850
3951
4052
4154
4255
4356
4458
4559
4660
4761
4863
4964
5065
5167
5268
5369
5471
5572
5673
5774
5876
5977
6078
6180
6281
6382
6484
6585
6686

[2,3,4,5,7,8,9,11,12,13,15,16,17,18,20,21,22,24,
 25,26,28,29,30,31,33,34,35,37,38,39,41,42,43,44,
 46,47,48,50,51,52,54,55,56,58,59,60,61,63,64,65,
 67,68,69,71,72,73,74,76,77,78,80,81,82,84,85,86]