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A072797 as a simple table

na(n)
00
11
22
33
44
55
67
76
88
99
1010
1111
1212
1313
1417
1518
1616
1714
1815
1920
2019
2121
2222
2323
2424
2525
2626
2727
2828
2929
3030
3131
3232
3333
3434
3535
3636
3745
3846
3948
4049
4150
4244
4347
4442
4537
4638
4743
4839
4940
5041
5154
5255
5353
5451
5552
5657
5756
5858
5959
6061
6160
6262
6363
6464
6565
6666
6767
6868
6969
7070
7171

[0,1,2,3,4,5,7,6,8,9,10,11,12,13,17,18,16,14,15,
 20,19,21,22,23,24,25,26,27,28,29,30,31,32,33,34,
 35,36,45,46,48,49,50,44,47,42,37,38,43,39,40,41,
 54,55,53,51,52,57,56,58,59,61,60,62,63,64,65,66,
 67,68,69,70,71]