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A131042 as a simple table

na(n)
11
22
34
43
55
66
77
88
910
109
1111
1212
1313
1414
1516
1615
1717
1818
1919
2020
2122
2221
2323
2424
2525
2626
2728
2827
2929
3030
3131
3232
3334
3433
3535
3636
3737
3838
3940
4039
4141
4242
4343
4444
4546
4645
4747
4848
4949
5050
5152
5251
5353
5454
5555
5656
5758
5857
5959
6060
6161
6262
6364
6463
6565
6666
6767
6868
6970
7069
7171
7272

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