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 | 7 |
| 2 | 787 |
| 3 | 877 |
| 4 | 887 |
| 5 | 7877 |
| 6 | 8887 |
| 7 | 78787 |
| 8 | 78877 |
| 9 | 78887 |
| 10 | 87877 |
| 11 | 87887 |
| 12 | 777787 |
| 13 | 777877 |
| 14 | 778777 |
| 15 | 787777 |
| 16 | 878777 |
| 17 | 888887 |
| 18 | 7778777 |
| 19 | 7788787 |
| 20 | 7877777 |
| 21 | 7878877 |
| 22 | 7878887 |
| 23 | 7888877 |
| 24 | 8787887 |
| 25 | 8788777 |
| 26 | 8877787 |
| 27 | 8887777 |
| 28 | 77778887 |
| 29 | 77787887 |
| 30 | 77877887 |