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A171818 as a simple table

na(n)
00
11
22
32
42
52
62
72
82
92
1010
1111
1212
1312
1412
1512
1612
1712
1812
1912
2020
2121
2222
2322
2422
2522
2622
2722
2822
2922
3020
3121
3222
3322
3422
3522
3622
3722
3822
3922
4020
4121
4222
4322
4422
4522
4622
4722
4822
4922
5020
5121
5222
5322
5422
5522
5622
5722
5822
5922
6020
6121
6222
6322
6422
6522
6622
6722
6822
6922
7020
7121
7222
7322
7422

[0,1,2,2,2,2,2,2,2,2,10,11,12,12,12,12,12,12,12,
 12,20,21,22,22,22,22,22,22,22,22,20,21,22,22,22,
 22,22,22,22,22,20,21,22,22,22,22,22,22,22,22,20,
 21,22,22,22,22,22,22,22,22,20,21,22,22,22,22,22,
 22,22,22,20,21,22,22,22]