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 | 240 |
| 2 | 4320 |
| 3 | 20160 |
| 4 | 70080 |
| 5 | 151200 |
| 6 | 362880 |
| 7 | 577920 |
| 8 | 1123200 |
| 9 | 1635120 |
| 10 | 2721600 |
| 11 | 3516480 |
| 12 | 5886720 |
| 13 | 6857760 |
| 14 | 10402560 |
| 15 | 12700800 |
| 16 | 17975040 |
| 17 | 20049120 |
| 18 | 29432160 |
| 19 | 31281600 |
| 20 | 44150400 |
| 21 | 48545280 |
| 22 | 63296640 |
| 23 | 67167360 |
| 24 | 94348800 |
| 25 | 94506000 |
| 26 | 123439680 |
| 27 | 132451200 |