n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 9 |
3 | 999 |
4 | 999999999 |
5 | 999999999999999999999999999 |
6 | 999999999999999999999999999999999999999999999999999999999999999999999999999999999 |
[1,3,9,999,999999999,999999999999999999999999999, 99999999999999999999999999999999999999999999999999\ 9999999999999999999999999999999] |