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 | 22 |
| 2 | 777 |
| 3 | 4444 |
| 4 | 200000 |
| 5 | 333000 |
| 6 | 333333 |
| 7 | 555555 |
| 8 | 660000 |
| 9 | 666666 |
| 10 | 700000 |
| 11 | 4444400 |
| 12 | 7700000 |
| 13 | 22333000 |
| 14 | 44445555 |
| 15 | 55556666 |
| 16 | 77700000 |
| 17 | 88888888 |
| 18 | 200000000 |
| 19 | 777770000 |
| 20 | 999900000 |
| 21 | 999999000 |
| 22 | 2222220000 |
| 23 | 22222200000 |
| 24 | 22333338888 |
| 25 | 28800000000 |
| 26 | 35555555505 |
| 27 | 111111000000 |
| 28 | 111777000000 |