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 | 18 |
| 2 | 198 |
| 3 | 1998 |
| 4 | 19998 |
| 5 | 199998 |
| 6 | 1999998 |
| 7 | 19999998 |
| 8 | 199999998 |
| 9 | 1999999998 |
| 10 | 19999999998 |
| 11 | 199999999998 |
| 12 | 1999999999998 |
| 13 | 19999999999998 |
| 14 | 199999999999998 |
| 15 | 1999999999999998 |
| 16 | 19999999999999998 |
| 17 | 199999999999999998 |
| 18 | 1999999999999999998 |
| 19 | 19999999999999999998 |