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) |
|---|---|
| 0 | 1 |
| 1 | 48 |
| 2 | 1512 |
| 3 | 40320 |
| 4 | 997920 |
| 5 | 23950080 |
| 6 | 570810240 |
| 7 | 13699445760 |
| 8 | 333923990400 |
| 9 | 8310997094400 |
| 10 | 211930425907200 |
| 11 | 5548723878297600 |
| 12 | 149353151057510400 |
| 13 | 4135933413900288000 |
| 14 | 117874102296158208000 |