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A064770 as a simple table

na(n)
00
11
21
31
42
52
62
72
82
93
1010
1111
1211
1311
1412
1512
1612
1712
1812
1913
2010
2111
2211
2311
2412
2512
2612
2712
2812
2913
3010
3111
3211
3311
3412
3512
3612
3712
3812
3913
4020
4121
4221
4321
4422
4522
4622
4722
4822
4923
5020
5121
5221
5321
5422
5522
5622
5722
5822
5923
6020
6121
6221
6321
6422
6522
6622
6722
6822
6923

[0,1,1,1,2,2,2,2,2,3,10,11,11,11,12,12,12,12,12,
 13,10,11,11,11,12,12,12,12,12,13,10,11,11,11,12,
 12,12,12,12,13,20,21,21,21,22,22,22,22,22,23,20,
 21,21,21,22,22,22,22,22,23,20,21,21,21,22,22,22,
 22,22,23]