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 | 120 |
| 3 | 1980 |
| 4 | 7920 |
| 5 | 30240 |
| 6 | 109200 |
| 7 | 120120 |
| 8 | 480480 |
| 9 | 491400 |
| 10 | 1853280 |
| 11 | 1884960 |
| 12 | 1965600 |
| 13 | 2106720 |
| 14 | 7207200 |
| 15 | 8168160 |
| 16 | 8482320 |
| 17 | 8648640 |
| 18 | 31600800 |
| 19 | 121080960 |
| 20 | 122522400 |
| 21 | 129729600 |
| 22 | 136936800 |
| 23 | 465585120 |
| 24 | 490089600 |
| 25 | 497296800 |
| 26 | 514594080 |
| 27 | 537213600 |
| 28 | 551350800 |