This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 98 |
| 4 | 99 |
| 5 | 100 |
| 6 | 9998 |
| 7 | 9999 |
| 8 | 10000 |
| 9 | 999998 |
| 10 | 999999 |
| 11 | 1000000 |
| 12 | 99999998 |
| 13 | 99999999 |
| 14 | 100000000 |
| 15 | 9999999998 |
| 16 | 9999999999 |
| 17 | 10000000000 |
| 18 | 999999999998 |
| 19 | 999999999999 |
| 20 | 1000000000000 |
| 21 | 99999999999998 |
| 22 | 99999999999999 |
| 23 | 100000000000000 |
| 24 | 9999999999999998 |
| 25 | 9999999999999999 |