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 | 4320 |
| 1 | 40320 |
| 2 | 210240 |
| 3 | 604800 |
| 4 | 1814400 |
| 5 | 3467520 |
| 6 | 7862400 |
| 7 | 13080960 |
| 8 | 24494400 |
| 9 | 35164800 |
| 10 | 64753920 |
| 11 | 82293120 |
| 12 | 135233280 |
| 13 | 177811200 |
| 14 | 269625600 |
| 15 | 320785920 |
| 16 | 500346720 |
| 17 | 563068800 |
| 18 | 838857600 |
| 19 | 970905600 |
| 20 | 1329229440 |
| 21 | 1477681920 |
| 22 | 2170022400 |
| 23 | 2268144000 |
| 24 | 3085992000 |