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A084384 as a simple table

na(n)
12
23
34
45
56
67
78
89
910
1011
1113
1214
1315
1417
1519
1621
1722
1823
1925
2026
2127
2229
2331
2432
2533
2634
2735
2837
2938
3039
3141
3243
3346
3447
3548
3649
3751
3853
3955
4057
4158
4259
4361
4462
4565
4667
4769
4871
4972
5073
5174
5277
5379
5480
5582
5683
5785
5886
5987
6089
6191
6293
6394
6495
6597
66101
67103
68106
69107
70108

[2,3,4,5,6,7,8,9,10,11,13,14,15,17,19,21,22,23,25,
 26,27,29,31,32,33,34,35,37,38,39,41,43,46,47,48,
 49,51,53,55,57,58,59,61,62,65,67,69,71,72,73,74,
 77,79,80,82,83,85,86,87,89,91,93,94,95,97,101,103,
 106,107,108]