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A189725 as a simple table

na(n)
12
23
34
46
57
69
710
812
914
1015
1116
1218
1319
1421
1523
1624
1725
1827
1928
2030
2132
2233
2334
2436
2538
2639
2740
2842
2943
3045
3146
3248
3350
3451
3552
3654
3755
3857
3959
4060
4161
4263
4365
4466
4567
4669
4770
4872
4973
5075
5177
5278
5379
5481
5582
5684
5786
5887
5988
6090
6192
6293
6394
6496
6597
6699
67100
68102
69104
70105
71106
72108
73110
74111
75112
76114
77115
78117
79118
80120
81122
82123
83124
84126

[2,3,4,6,7,9,10,12,14,15,16,18,19,21,23,24,25,27,
 28,30,32,33,34,36,38,39,40,42,43,45,46,48,50,51,
 52,54,55,57,59,60,61,63,65,66,67,69,70,72,73,75,
 77,78,79,81,82,84,86,87,88,90,92,93,94,96,97,99,
 100,102,104,105,106,108,110,111,112,114,115,117,
 118,120,122,123,124,126]