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A261729 as a simple table

na(n)
00
11
22
33
44
55
66
77
88
99
1019
1118
1217
1316
1415
1514
1613
1712
1811
1910
2020
2121
2222
2323
2424
2525
2626
2727
2828
2929
3039
3138
3237
3336
3435
3534
3633
3732
3831
3930
4040
4141
4242
4343
4444
4545
4646
4747
4848
4949
5059
5158
5257
5356
5455
5554
5653
5752
5851
5950
6060
6161
6262
6363
6464
6565
6666
6767

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