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A381610 as a simple table

na(n)
00
11
22
33
44
55
66
77
88
99
1010
1111
1212
1313
1414
1515
1616
1717
1818
1919
2020
2121
2222
2323
2427
2524
2628
2725
2829
2926
3030
3131
3232
3333
3434
3535
3636
3737
3838
3939
4040
4141
4242
4343
4444
4545
4646
4747
4848
4949
5050
5154
5251
5355
5452
5556
5653
5757
5858
5959
6060
6161
6262
6363
6464
6565
6666
6767

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