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 | 727 |
| 2 | 757 |
| 3 | 787 |
| 4 | 797 |
| 5 | 77377 |
| 6 | 77477 |
| 7 | 77977 |
| 8 | 7772777 |
| 9 | 7774777 |
| 10 | 7778777 |
| 11 | 777767777 |
| 12 | 77777677777 |
| 13 | 7777774777777 |
| 14 | 777777727777777 |
| 15 | 777777757777777 |
| 16 | 77777777677777777 |
| 17 | 77777777977777777 |
| 18 | 777777777727777777777 |