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 | 24 |
| 2 | 6732 |
| 3 | 2771340 |
| 4 | 1342525275 |
| 5 | 711891288108 |
| 6 | 399866544799722 |
| 7 | 233750557331494632 |
| 8 | 140707672445849703480 |
| 9 | 86621407014527646518400 |
| 10 | 54278825541246092520182592 |
| 11 | 34504174655166790354911360048 |
| 12 | 22195631874904018057471849288020 |
| 13 | 14421008706115620277976088538033200 |