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 | 0 |
| 1 | 24 |
| 2 | 384 |
| 3 | 4056 |
| 4 | 38400 |
| 5 | 351384 |
| 6 | 3179904 |
| 7 | 28671576 |
| 8 | 258201600 |
| 9 | 2324286744 |
| 10 | 20919997824 |
| 11 | 188284231896 |
| 12 | 1694570841600 |
| 13 | 15251175838104 |
| 14 | 137260697334144 |
| 15 | 1235346620381016 |
| 16 | 11118120616550400 |
| 17 | 100063088648317464 |
| 18 | 900567807132948864 |
| 19 | 8105110292090814936 |