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A283971 as a simple table

na(n)
00
11
21
33
44
55
63
77
88
99
105
1111
1212
1313
147
1515
1616
1717
189
1919
2020
2121
2211
2323
2424
2525
2613
2727
2828
2929
3015
3131
3232
3333
3417
3535
3636
3737
3819
3939
4040
4141
4221
4343
4444
4545
4623
4747
4848
4949
5025
5151
5252
5353
5427
5555
5656
5757
5829
5959
6060
6161
6231
6363
6464
6565
6633
6767

[0,1,1,3,4,5,3,7,8,9,5,11,12,13,7,15,16,17,9,19,
 20,21,11,23,24,25,13,27,28,29,15,31,32,33,17,35,
 36,37,19,39,40,41,21,43,44,45,23,47,48,49,25,51,
 52,53,27,55,56,57,29,59,60,61,31,63,64,65,33,67]