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 | 1 |
| 2 | 5 |
| 3 | 25 |
| 4 | 1025 |
| 5 | 501025 |
| 6 | 250501025 |
| 7 | 10250250501025 |
| 8 | 501025010250250501025 |
| 9 | 2505010250501025010250250501025 |
| 10 | 1025025050102502505010250501025010250250501025 |