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A026467 as a simple table

na(n)
12
23
34
45
56
67
78
89
910
1011
1112
1214
1315
1416
1517
1618
1719
1821
1922
2023
2124
2226
2327
2428
2530
2631
2732
2833
2935
3036
3137
3238
3339
3442
3543
3644
3746
3847
3948
4049
4150
4251
4354
4455
4556
4657
4759
4860
4962
5063
5164
5266
5367
5469
5570
5671
5772
5875
5976
6077

[2,3,4,5,6,7,8,9,10,11,12,14,15,16,17,18,19,21,22,
 23,24,26,27,28,30,31,32,33,35,36,37,38,39,42,43,
 44,46,47,48,49,50,51,54,55,56,57,59,60,62,63,64,
 66,67,69,70,71,72,75,76,77]