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A020900 as a simple table

na(n)
12
23
34
46
58
69
711
812
914
1016
1118
1221
1322
1423
1524
1627
1730
1830
1932
2034
2134
2237
2338
2440
2544
2646
2746
2847
2947
3048
3154
3255
3358
3459
3562
3662
3765
3866
3967
4068
4171
4272
4375
4476
4577
4678
4782
4886
4987
5088
5190
5291
5392
5495
5597
5699
5799
58100
59101
60102
61103
62106
63112

[2,3,4,6,8,9,11,12,14,16,18,21,22,23,24,27,30,30,
 32,34,34,37,38,40,44,46,46,47,47,48,54,55,58,59,
 62,62,65,66,67,68,71,72,75,76,77,78,82,86,87,88,
 90,91,92,95,97,99,99,100,101,102,103,106,112]