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 | 77 |
| 3 | 1771 |
| 4 | 178871 |
| 5 | 1788888871 |
| 6 | 178888888888888871 |
| 7 | 17111188118888288288881188111171 |