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 | 720 |
| 2 | 22428 |
| 3 | 1611504 |
| 4 | 168199200 |
| 5 | 21676931712 |
| 6 | 3195557904564 |
| 7 | 517064870788848 |
| 8 | 89580965599606752 |
| 9 | 16352303769375910848 |
| 10 | 3110686153486233022944 |