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A075348 as a simple table

na(n)
12
21
34
43
55
69
76
87
98
1010
1111
1212
1313
1414
1517
1615
1716
1818
1919
2020
2121
2222
2323
2424
2525
2626
2727
2832
2928
3029
3130
3231
3333
3434
3535
3637
3736
3838
3939
4040
4141
4242
4343
4444
4550
4645
4746
4847
4948
5049
5151
5252
5353
5454
5558
5655
5756
5857
5959
6060
6161
6262
6363
6464
6565
6671
6766
6867
6968
7069
7170
7272

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