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 | 5 |
| 4 | 25 |
| 5 | 625 |
| 6 | 390625 |
| 7 | 152587890625 |
| 8 | 23283064365386962890625 |
| 9 | 542101086242752217003726400434970855712890625 |