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A047423 as a simple table

na(n)
12
23
34
45
56
610
711
812
913
1014
1118
1219
1320
1421
1522
1626
1727
1828
1929
2030
2134
2235
2336
2437
2538
2642
2743
2844
2945
3046
3150
3251
3352
3453
3554
3658
3759
3860
3961
4062
4166
4267
4368
4469
4570
4674
4775
4876
4977
5078
5182
5283
5384
5485
5586
5690
5791
5892
5993
6094
6198
6299
63100
64101
65102

[2,3,4,5,6,10,11,12,13,14,18,19,20,21,22,26,27,28,
 29,30,34,35,36,37,38,42,43,44,45,46,50,51,52,53,
 54,58,59,60,61,62,66,67,68,69,70,74,75,76,77,78,
 82,83,84,85,86,90,91,92,93,94,98,99,100,101,102]