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 | 2 |
| 2 | 8 |
| 3 | 1152 |
| 4 | 1605632 |
| 5 | 43913893117952 |
| 6 | 98583626709555431615548620800 |
| 7 | 197241992148713072661201501950348880945923403897735704916000768 |