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 | 12 |
| 3 | 4284 |
| 4 | 84720384 |
| 5 | 148993369113600 |
| 6 | 34155172566092379340800 |
| 7 | 1406681240638328150516203644518400 |
| 8 | 13722109275339434419337247034130459935742361600 |