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A228723 as a simple table

na(n)
00
11
22
33
44
55
66
77
88
99
1010
1112
1212
1314
1414
1516
1616
1718
1818
1921
2021
2121
2223
2323
2425
2525
2627
2727
2829
2929
3030
3132
3232
3334
3434
3536
3636
3738
3838
3941
4041
4141
4243
4343
4445
4545
4647
4747
4849
4949
5050
5152
5252
5354
5454
5556
5656
5758
5858
5961
6061
6161
6263
6363
6465
6565
6667

[0,1,2,3,4,5,6,7,8,9,10,12,12,14,14,16,16,18,18,
 21,21,21,23,23,25,25,27,27,29,29,30,32,32,34,34,
 36,36,38,38,41,41,41,43,43,45,45,47,47,49,49,50,
 52,52,54,54,56,56,58,58,61,61,61,63,63,65,65,67]