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A047518 as a simple table

na(n)
12
23
34
46
57
610
711
812
914
1015
1118
1219
1320
1422
1523
1626
1727
1828
1930
2031
2134
2235
2336
2438
2539
2642
2743
2844
2946
3047
3150
3251
3352
3454
3555
3658
3759
3860
3962
4063
4166
4267
4368
4470
4571
4674
4775
4876
4978
5079
5182
5283
5384
5486
5587
5690

[2,3,4,6,7,10,11,12,14,15,18,19,20,22,23,26,27,28,
 30,31,34,35,36,38,39,42,43,44,46,47,50,51,52,54,
 55,58,59,60,62,63,66,67,68,70,71,74,75,76,78,79,
 82,83,84,86,87,90]