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 | 24 |
| 2 | 720 |
| 3 | 19296 |
| 4 | 517920 |
| 5 | 13893264 |
| 6 | 372707136 |
| 7 | 9998360256 |
| 8 | 268219317312 |
| 9 | 7195339794744 |
| 10 | 193024557070560 |
| 11 | 5178140391612960 |
| 12 | 138910500937231488 |
| 13 | 3726458885094926160 |
| 14 | 99967214347459657344 |
| 15 | 2681753442755678231616 |