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A028899 as a simple table

na(n)
00
11
22
33
44
55
66
77
88
99
104
115
126
137
148
159
1610
1711
1812
1913
208
219
2210
2311
2412
2513
2614
2715
2816
2917
3012
3113
3214
3315
3416
3517
3618
3719
3820
3921
4016
4117
4218
4319
4420
4521
4622
4723
4824
4925
5020
5121
5222
5323
5424
5525
5626
5727
5828
5929
6024
6125
6226
6327
6428
6529
6630
6731
6832
6933
7028
7129
7230
7331
7432
7533

[0,1,2,3,4,5,6,7,8,9,4,5,6,7,8,9,10,11,12,13,8,9,
 10,11,12,13,14,15,16,17,12,13,14,15,16,17,18,19,
 20,21,16,17,18,19,20,21,22,23,24,25,20,21,22,23,
 24,25,26,27,28,29,24,25,26,27,28,29,30,31,32,33,
 28,29,30,31,32,33]