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A274399 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
2223
2324
2425
2526
2627
2728
2829
2930
3031
3132
3233
3334
3435
3536
3637
3738
3839
3940
4041
4142
4243
4345
4446
4547
4648
4749
4850
4951
5052
5153
5254
5355
5456
5557
5658
5759
5860
5961
6062
6163
6264
6365
6467
6568
6669
6770

[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,
 19,20,21,23,24,25,26,27,28,29,30,31,32,33,34,35,
 36,37,38,39,40,41,42,43,45,46,47,48,49,50,51,52,
 53,54,55,56,57,58,59,60,61,62,63,64,65,67,68,69,
 70]