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A081606 as a simple table

na(n)
11
23
34
45
57
69
710
811
912
1013
1114
1215
1316
1417
1519
1621
1722
1823
1925
2027
2128
2229
2330
2431
2532
2633
2734
2835
2936
3037
3138
3239
3340
3441
3542
3643
3744
3845
3946
4047
4148
4249
4350
4451
4552
4653
4755
4857
4958
5059
5161
5263
5364
5465
5566
5667
5768
5869
5970
6071
6173
6275
6376
6477
6579
6681
6782
6883
6984
7085
7186

[1,3,4,5,7,9,10,11,12,13,14,15,16,17,19,21,22,23,
 25,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,
 42,43,44,45,46,47,48,49,50,51,52,53,55,57,58,59,
 61,63,64,65,66,67,68,69,70,71,73,75,76,77,79,81,
 82,83,84,85,86]