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A261874 as a simple table

na(n)
12
23
34
45
56
67
78
89
912
1015
1118
1220
1321
1422
1524
1626
1727
1828
1930
2033
2136
2239
2340
2442
2544
2645
2746
2848
2950
3051
3154
3255
3357
3460
3562
3663
3764
3866
3968
4069
4170
4272
4375
4477
4578
4680
4781
4882
4984
5086
5187
5288
5390
5493
5596
5699
57102
58105
59108
60110
61111
62112
63114
64116
65117

[2,3,4,5,6,7,8,9,12,15,18,20,21,22,24,26,27,28,30,
 33,36,39,40,42,44,45,46,48,50,51,54,55,57,60,62,
 63,64,66,68,69,70,72,75,77,78,80,81,82,84,86,87,
 88,90,93,96,99,102,105,108,110,111,112,114,116,
 117]