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A287929 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
2122
2224
2321
2423
2525
2627
2729
2826
2928
3030
3132
3231
3334
3436
3533
3635
3738
3837
3939
4040
4142
4245
4344
4443
4541
4646
4747
4848
4949
5050
5152
5255
5353
5451
5557
5659
5754
5856
5958
6060
6162
6264
6366
6467
6561
6663
6765

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