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) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 24 |
| 3 | 336 |
| 4 | 354144 |
| 5 | 116749235904 |
| 6 | 22940770664883067253376 |
| 7 | 182503181432559739767250904458105698387204864 |