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A206551 as a simple table

na(n)
11
22
33
44
55
66
77
88
99
1010
1111
1213
1314
1415
1516
1617
1718
1819
1921
2022
2123
2225
2326
2427
2529
2631
2732
2833
2934
3035
3137
3238
3339
3441
3543
3645
3746
3847
3949
4050
4151
4253
4354
4455
4557
4658
4759
4861
4962
5064
5167
5269
5371
5473
5574
5675
5777
5879
5981
6082
6183
6286
6387
6489
6593
6694
6795
6897
6998
7099

[1,2,3,4,5,6,7,8,9,10,11,13,14,15,16,17,18,19,21,
 22,23,25,26,27,29,31,32,33,34,35,37,38,39,41,43,
 45,46,47,49,50,51,53,54,55,57,58,59,61,62,64,67,
 69,71,73,74,75,77,79,81,82,83,86,87,89,93,94,95,
 97,98,99]