n | a(n) |
---|---|
1 | 0 |
2 | 99 |
3 | 990 |
4 | 9900990 |
5 | 99990 |
6 | 99990099990 |
7 | 9999990 |
8 | 999999009999990 |
9 | 999999990 |
10 | 9999999900999999990 |
11 | 99999999990 |
12 | 99999999990099999999990 |
13 | 9999999999990 |
[0,99,990,9900990,99990,99990099990,9999990, 999999009999990,999999990,9999999900999999990, 99999999990,99999999990099999999990,9999999999990] |