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A089869 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
2122
2221
2323
2424
2525
2626
2727
2828
2929
3030
3131
3232
3333
3434
3536
3635
3737
3838
3939
4040
4141
4242
4343
4444
4545
4646
4747
4848
4950
5049
5151
5252
5353
5454
5555
5660
5761
5864
5963
6056
6157
6259
6358
6462
6565
6666
6767
6868
6969

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