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 | 5 |
| 2 | 420 |
| 3 | 7440 |
| 4 | 8190 |
| 5 | 18600 |
| 6 | 121920 |
| 7 | 131040 |
| 8 | 95472000 |
| 9 | 102136320 |
| 10 | 197308800 |
| 11 | 433305600 |
| 12 | 503255040 |
| 13 | 71271827200 |
| 14 | 91967616000 |
| 15 | 128848035840 |
| 16 | 190066406400 |
| 17 | 287879454720 |
| 18 | 354560976000 |
| 19 | 799959888000 |
| 20 | 2061580369920 |
| 21 | 2208930048000 |
| 22 | 100368143884800 |
| 23 | 341546502528000 |