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A069908 as a simple table

na(n)
12
23
34
45
511
612
713
814
918
1019
1120
1221
1327
1428
1529
1630
1734
1835
1936
2037
2143
2244
2345
2446
2550
2651
2752
2853
2959
3060
3161
3262
3366
3467
3568
3669
3775
3876
3977
4078
4182
4283
4384
4485
4591
4692
4793
4894
4998
5099
51100
52101
53107
54108
55109
56110
57114
58115
59116
60117
61123

[2,3,4,5,11,12,13,14,18,19,20,21,27,28,29,30,34,
 35,36,37,43,44,45,46,50,51,52,53,59,60,61,62,66,
 67,68,69,75,76,77,78,82,83,84,85,91,92,93,94,98,
 99,100,101,107,108,109,110,114,115,116,117,123]