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 | 12 |
| 2 | 720 |
| 3 | 15120 |
| 4 | 11200 |
| 5 | 332640 |
| 6 | 908107200 |
| 7 | 4324320 |
| 8 | 2940537600 |
| 9 | 175991175360 |
| 10 | 512143632000 |
| 11 | 1427794368 |
| 12 | 7795757249280 |
| 13 | 107084577600 |
| 14 | 279490747536000 |
| 15 | 200143324310529600 |
| 16 | 1178332991611776000 |
| 17 | 157531148611200 |
| 18 | 906996615309386784000 |
| 19 | 5828652498614400 |
| 20 | 262872227687509440000 |