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A287928 as a simple table

na(n)
11
22
33
44
55
66
77
88
99
1010
1112
1211
1313
1415
1514
1616
1718
1817
1919
2020
2123
2221
2324
2422
2525
2628
2726
2829
2927
3030
3132
3231
3335
3433
3536
3634
3738
3837
3939
4040
4145
4241
4344
4443
4542
4646
4747
4848
4949
5050
5154
5251
5353
5457
5552
5658
5755
5859
5956
6060
6165
6261
6366
6462
6567
6663
6764

[1,2,3,4,5,6,7,8,9,10,12,11,13,15,14,16,18,17,19,
 20,23,21,24,22,25,28,26,29,27,30,32,31,35,33,36,
 34,38,37,39,40,45,41,44,43,42,46,47,48,49,50,54,
 51,53,57,52,58,55,59,56,60,65,61,66,62,67,63,64]