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A047315 as a simple table

na(n)
12
24
35
46
59
611
712
813
916
1018
1119
1220
1323
1425
1526
1627
1730
1832
1933
2034
2137
2239
2340
2441
2544
2646
2747
2848
2951
3053
3154
3255
3358
3460
3561
3662
3765
3867
3968
4069
4172
4274
4375
4476
4579
4681
4782
4883
4986
5088
5189
5290
5393
5495
5596
5697
57100
58102
59103
60104
61107
62109
63110
64111

[2,4,5,6,9,11,12,13,16,18,19,20,23,25,26,27,30,32,
 33,34,37,39,40,41,44,46,47,48,51,53,54,55,58,60,
 61,62,65,67,68,69,72,74,75,76,79,81,82,83,86,88,
 89,90,93,95,96,97,100,102,103,104,107,109,110,111]