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A073209 as a simple table

na(n)
00
11
22
33
44
57
65
76
88
99
1010
1117
1216
1318
1411
1521
1612
1714
1820
1913
2015
2119
2222
2323
2424
2525
2626
2727
2845
2946
3044
3142
3249
3348
3443
3547
3650
3728
3829
3958
4056
4163
4230
4357
4431
4537
4638
4732
4854
4953
5062
5133
5259
5334
5439
5561
5635
5740
5851
5955
6036
6141
6252
6360
6464
6565
6666
6767
6868
6969
7070
7171

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