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 | 5 |
| 1 | 757 |
| 2 | 77577 |
| 3 | 7775777 |
| 4 | 777757777 |
| 5 | 77777577777 |
| 6 | 7777775777777 |
| 7 | 777777757777777 |
| 8 | 77777777577777777 |
| 9 | 7777777775777777777 |
| 10 | 777777777757777777777 |
| 11 | 77777777777577777777777 |
| 12 | 7777777777775777777777777 |
| 13 | 777777777777757777777777777 |
| 14 | 77777777777777577777777777777 |
| 15 | 7777777777777775777777777777777 |