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 | 0 |
| 2 | 1 |
| 3 | 56 |
| 4 | 3201 |
| 5 | 307016 |
| 6 | 43200625 |
| 7 | 8403205056 |
| 8 | 2162875665601 |
| 9 | 712215325718576 |
| 10 | 292162814336854881 |
| 11 | 146127700393451369000 |