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 | 4 |
| 2 | 76 |
| 3 | 2544 |
| 4 | 123696 |
| 5 | 7942080 |
| 6 | 635633280 |
| 7 | 61009159680 |
| 8 | 6831940227840 |
| 9 | 874493448514560 |
| 10 | 125946241018214400 |
| 11 | 20156433977646489600 |
| 12 | 3548609812373223628800 |
| 13 | 681555522002874494976000 |
| 14 | 141810253720479017017344000 |