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 | 3 |
| 2 | 24 |
| 3 | 288 |
| 4 | 4440 |
| 5 | 82080 |
| 6 | 1752000 |
| 7 | 42178800 |
| 8 | 1127335680 |
| 9 | 33073099200 |
| 10 | 1055891810880 |
| 11 | 36435757294080 |
| 12 | 1351364788224000 |
| 13 | 53617083034314240 |
| 14 | 2266453101278568960 |
| 15 | 101705245560225146880 |
| 16 | 4829501671573344393600 |