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 | 4 |
| 3 | 24 |
| 4 | 120 |
| 5 | 624 |
| 6 | 3096 |
| 7 | 15624 |
| 8 | 78000 |
| 9 | 390600 |
| 10 | 1952496 |
| 11 | 9765624 |
| 12 | 48824880 |
| 13 | 244140624 |
| 14 | 1220687496 |
| 15 | 6103514976 |
| 16 | 30517500000 |
| 17 | 152587890624 |
| 18 | 762939059400 |
| 19 | 3814697265624 |
| 20 | 19073484374880 |
| 21 | 95367431624976 |
| 22 | 476837148437496 |
| 23 | 2384185791015624 |
| 24 | 11920928906172000 |