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 | 1 |
| 3 | 80 |
| 4 | 3778 |
| 5 | 1742881 |
| 6 | 2546661201 |
| 7 | 16353452350876 |
| 8 | 411980921235969243 |