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A236866 as a simple table

na(n)
12
23
34
45
56
67
78
89
910
1011
1112
1213
1315
1416
1517
1618
1719
1820
1922
2023
2124
2226
2327
2428
2529
2630
2731
2834
2935
3037
3138
3240
3341
3442
3544
3645
3747
3848
3949
4051
4152
4253
4354
4457
4560
4661
4762
4863
4964
5065
5167
5269
5371
5472
5573
5674
5775
5876
5979
6082
6183
6284
6385
6489
6590
6693
6794
6895

[2,3,4,5,6,7,8,9,10,11,12,13,15,16,17,18,19,20,22,
 23,24,26,27,28,29,30,31,34,35,37,38,40,41,42,44,
 45,47,48,49,51,52,53,54,57,60,61,62,63,64,65,67,
 69,71,72,73,74,75,76,79,82,83,84,85,89,90,93,94,
 95]