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 | 2 |
| 1 | 11 |
| 2 | 79 |
| 3 | 787 |
| 4 | 7789 |
| 5 | 77783 |
| 6 | 777781 |
| 7 | 7777801 |
| 8 | 77777803 |
| 9 | 777777799 |
| 10 | 7777777781 |
| 11 | 77777777827 |
| 12 | 777777777841 |
| 13 | 7777777777859 |
| 14 | 77777777777837 |
| 15 | 777777777777787 |
| 16 | 7777777777777867 |
| 17 | 77777777777777797 |
| 18 | 777777777777777817 |