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 | 2 |
| 2 | 512 |
| 3 | 17173512 |
| 4 | 15625483754992317173512 |
| 5 | 15625000000000046875483750000046875967504992315625483754992317173512 |