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A091213 as a simple table

na(n)
11
23
34
45
56
67
78
89
910
1012
1113
1214
1315
1417
1518
1619
1720
1822
1923
2024
2125
2226
2327
2428
2529
2630
2731
2833
2934
3035
3136
3237
3338
3439
3540
3642
3743
3844
3945
4046
4147
4248
4349
4450
4551
4652
4753
4854
4956
5057
5158
5259
5360
5461
5563
5664
5765
5867
5968
6069
6170
6272
6373
6474
6575
6676
6777
6878
6979
7080
7182

[1,3,4,5,6,7,8,9,10,12,13,14,15,17,18,19,20,22,23,
 24,25,26,27,28,29,30,31,33,34,35,36,37,38,39,40,
 42,43,44,45,46,47,48,49,50,51,52,53,54,56,57,58,
 59,60,61,63,64,65,67,68,69,70,72,73,74,75,76,77,
 78,79,80,82]