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 | 7 |
| 1 | 575 |
| 2 | 55755 |
| 3 | 5557555 |
| 4 | 555575555 |
| 5 | 55555755555 |
| 6 | 5555557555555 |
| 7 | 555555575555555 |
| 8 | 55555555755555555 |
| 9 | 5555555557555555555 |
| 10 | 555555555575555555555 |
| 11 | 55555555555755555555555 |
| 12 | 5555555555557555555555555 |
| 13 | 555555555555575555555555555 |
| 14 | 55555555555555755555555555555 |
| 15 | 5555555555555557555555555555555 |