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A064683 as a simple table

na(n)
11
22
33
44
55
66
77
88
99
1010
1111
1213
1314
1415
1517
1618
1719
1820
1921
2022
2123
2226
2327
2428
2529
2630
2731
2833
2934
3035
3137
3238
3339
3440
3541
3642
3743
3844
3945
4046
4147
4249
4350
4451
4553
4654
4755
4857
4958
5059
5160
5261
5362
5463
5565
5666
5767
5868
5969
6070
6171
6273
6374
6477
6578
6679
6780
6881
6982
7083
7184
7285

[1,2,3,4,5,6,7,8,9,10,11,13,14,15,17,18,19,20,21,
 22,23,26,27,28,29,30,31,33,34,35,37,38,39,40,41,
 42,43,44,45,46,47,49,50,51,53,54,55,57,58,59,60,
 61,62,63,65,66,67,68,69,70,71,73,74,77,78,79,80,
 81,82,83,84,85]