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A099649 as a simple table

na(n)
12
23
34
45
56
67
78
89
911
1012
1114
1215
1316
1417
1518
1619
1720
1821
1922
2024
2125
2226
2327
2428
2529
2630
2733
2834
2935
3036
3137
3238
3339
3440
3541
3642
3743
3845
3946
4047
4148
4249
4350
4451
4552
4653
4754
4855
4956
5057
5158
5259
5360
5461
5562
5663
5764
5865
5966
6067
6168
6269
6370
6471
6572
6673
6774
6875
6976
7077
7178
7279

[2,3,4,5,6,7,8,9,11,12,14,15,16,17,18,19,20,21,22,
 24,25,26,27,28,29,30,33,34,35,36,37,38,39,40,41,
 42,43,45,46,47,48,49,50,51,52,53,54,55,56,57,58,
 59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,
 75,76,77,78,79]