n | a(n) |
---|---|
2 | 19 |
3 | 199 |
4 | 1999 |
5 | 99991 |
6 | 199999 |
7 | 9999991 |
8 | 19999999 |
9 | 0 |
10 | 9199999999 |
11 | 99999199999 |
12 | 991999999999 |
13 | 9919999999999 |
14 | 99999999991999 |
15 | 919999999999999 |
16 | 9999999999999199 |
17 | 99919999999999999 |
18 | 0 |
19 | 9991999999999999999 |
20 | 99999199999999999999 |
21 | 0 |
22 | 9991999999999999999999 |
[19,199,1999,99991,199999,9999991,19999999,0, 9199999999,99999199999,991999999999,9919999999999, 99999999991999,919999999999999,9999999999999199, 99919999999999999,0,9991999999999999999, 99999199999999999999,0,9991999999999999999999] |