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) |
|---|---|
| 0 | 1 |
| 1 | 9 |
| 2 | 97 |
| 3 | 993 |
| 4 | 9985 |
| 5 | 99969 |
| 6 | 999937 |
| 7 | 9999873 |
| 8 | 99999745 |
| 9 | 999999489 |
| 10 | 9999998977 |
| 11 | 99999997953 |
| 12 | 999999995905 |
| 13 | 9999999991809 |
| 14 | 99999999983617 |
| 15 | 999999999967233 |
| 16 | 9999999999934465 |
| 17 | 99999999999868929 |
| 18 | 999999999999737857 |
| 19 | 9999999999999475713 |
| 20 | 99999999999998951425 |