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 | 8 |
| 4 | 2835 |
| 5 | 167382319104 |
| 6 | 1319281996032000000 |
| 7 | 13730296368223523839986892800000000 |
| 8 | 125890362600954779500814809426933398033089280000000000 |