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A181709 as a simple table

na(n)
12
23
34
45
56
67
78
810
911
1013
1114
1215
1316
1418
1520
1621
1723
1824
1925
2027
2128
2230
2333
2434
2535
2636
2737
2838
2943
3044
3146
3247
3350
3451
3553
3655
3756
3858
3960
4061
4164
4265
4366
4467
4571
4675
4776
4877
4978
5080
5181
5284
5386
5488
5590
5691
5793
5894
5995
6098
61103
62104
63105
64106
65111
66113
67116
68117
69118

[2,3,4,5,6,7,8,10,11,13,14,15,16,18,20,21,23,24,
 25,27,28,30,33,34,35,36,37,38,43,44,46,47,50,51,
 53,55,56,58,60,61,64,65,66,67,71,75,76,77,78,80,
 81,84,86,88,90,91,93,94,95,98,103,104,105,106,111,
 113,116,117,118]