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 | 50 |
| 3 | 1626 |
| 4 | 83736 |
| 5 | 6026120 |
| 6 | 571350096 |
| 7 | 67996818960 |
| 8 | 9862902275456 |
| 9 | 1700092943088768 |
| 10 | 342087177215788800 |
| 11 | 79115601821198404352 |
| 12 | 20779757607847901690880 |
| 13 | 6133520505473954148381696 |
| 14 | 2017134796016735182500521984 |
| 15 | 733523863838078950241395968000 |