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 | 6 |
| 1 | 767 |
| 2 | 77677 |
| 3 | 7776777 |
| 4 | 777767777 |
| 5 | 77777677777 |
| 6 | 7777776777777 |
| 7 | 777777767777777 |
| 8 | 77777777677777777 |
| 9 | 7777777776777777777 |
| 10 | 777777777767777777777 |
| 11 | 77777777777677777777777 |
| 12 | 7777777777776777777777777 |
| 13 | 777777777777767777777777777 |
| 14 | 77777777777777677777777777777 |
| 15 | 7777777777777776777777777777777 |