n | a(n) |
---|---|
1 | 0 |
2 | 900 |
3 | 99000 |
4 | 9990000 |
5 | 999900000 |
6 | 99999000000 |
7 | 9999990000000 |
8 | 999999900000000 |
9 | 99999999000000000 |
10 | 9999999990000000000 |
11 | 999999999900000000000 |
12 | 99999999999000000000000 |
13 | 9999999999990000000000000 |
14 | 999999999999900000000000000 |
15 | 99999999999999000000000000000 |
[0,900,99000,9990000,999900000,99999000000, 9999990000000,999999900000000,99999999000000000, 9999999990000000000,999999999900000000000, 99999999999000000000000,9999999999990000000000000, 999999999999900000000000000, 99999999999999000000000000000] |