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 | 57 |
| 2 | 77 |
| 3 | 3777 |
| 4 | 17777 |
| 5 | 277777 |
| 6 | 1777777 |
| 7 | 17777777 |
| 8 | 707777777 |
| 9 | 3777777777 |
| 10 | 17777777777 |
| 11 | 577777777777 |
| 12 | 1777777777777 |
| 13 | 37777777777777 |
| 14 | 757777777777777 |
| 15 | 4777777777777777 |
| 16 | 37777777777777777 |
| 17 | 277777777777777777 |