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A258742 as a simple table

na(n)
11
23
34
42
56
67
75
89
98
1010
1111
1212
1314
1413
1515
1616
1717
1819
1918
2020
2121
2222
2324
2423
2525
2627
2726
2828
2929
3031
3132
3230
3333
3434
3536
3637
3735
3838
3939
4041
4140
4242
4344
4443
4545
4646
4747
4849
4948
5050
5152
5251
5353
5454
5555
5656
5757
5858
5959
6060
6162
6261
6363
6464
6565
6667
6766
6868
6969
7071
7172
7270
7373
7474
7575
7676
7777
7878
7979
8081

[1,3,4,2,6,7,5,9,8,10,11,12,14,13,15,16,17,19,18,
 20,21,22,24,23,25,27,26,28,29,31,32,30,33,34,36,
 37,35,38,39,41,40,42,44,43,45,46,47,49,48,50,52,
 51,53,54,55,56,57,58,59,60,62,61,63,64,65,67,66,
 68,69,71,72,70,73,74,75,76,77,78,79,81]