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 | 6 |
| 2 | 76 |
| 3 | 776 |
| 4 | 7776 |
| 5 | 67776 |
| 6 | 667776 |
| 7 | 6667776 |
| 8 | 66667776 |
| 9 | 766667776 |
| 10 | 6766667776 |
| 11 | 66766667776 |
| 12 | 666766667776 |
| 13 | 7666766667776 |
| 14 | 77666766667776 |
| 15 | 777666766667776 |
| 16 | 7777666766667776 |
| 17 | 77777666766667776 |
| 18 | 777777666766667776 |