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A073197 as a simple table

na(n)
00
11
22
33
44
57
65
76
88
99
1010
1117
1216
1320
1411
1518
1612
1714
1819
1913
2021
2115
2222
2323
2424
2525
2626
2727
2845
2946
3044
3142
3257
3354
3443
3553
3661
3728
3829
3948
4047
4155
4230
4349
4431
4537
4638
4735
4851
4940
5063
5133
5250
5332
5458
5560
5634
5756
5839
5941
6036
6162
6252
6359
6464
6565
6666
6767
6868
6969
7070
7171

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