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 | 0 |
| 1 | 9 |
| 2 | 1089 |
| 3 | 110889 |
| 4 | 11108889 |
| 5 | 1111088889 |
| 6 | 111110888889 |
| 7 | 11111108888889 |
| 8 | 1111111088888889 |
| 9 | 111111110888888889 |
| 10 | 11111111108888888889 |
| 11 | 1111111111088888888889 |
| 12 | 111111111110888888888889 |
| 13 | 11111111111108888888888889 |
| 14 | 1111111111111088888888888889 |
| 15 | 111111111111110888888888888889 |