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 | 11 |
| 1 | 171 |
| 2 | 1771 |
| 3 | 17771 |
| 4 | 177771 |
| 5 | 1777771 |
| 6 | 17777771 |
| 7 | 177777771 |
| 8 | 1777777771 |
| 9 | 17777777771 |
| 10 | 177777777771 |
| 11 | 1777777777771 |
| 12 | 17777777777771 |
| 13 | 177777777777771 |
| 14 | 1777777777777771 |
| 15 | 17777777777777771 |
| 16 | 177777777777777771 |
| 17 | 1777777777777777771 |
| 18 | 17777777777777777771 |