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) |
|---|---|
| 2 | 1 |
| 3 | 8 |
| 4 | 72 |
| 5 | 768 |
| 6 | 12400 |
| 7 | 217728 |
| 8 | 7112448 |
| 9 | 94371840 |
| 10 | 2594586816 |
| 11 | 69139840000 |
| 12 | 2584376931840 |
| 13 | 58779453358080 |
| 14 | 4367959006806720 |
| 15 | 100089965305451520 |
| 16 | 3251736576000000000 |
| 17 | 200445251536048619520 |
| 18 | 12343971160877345120064 |
| 19 | 422076038504126628593664 |