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 | 1 |
| 2 | 2 |
| 3 | 24 |
| 4 | 20736 |
| 5 | 309586821120 |
| 6 | 11501279977342425366528000000 |
| 7 | 115744510977565557983391999957434605749927936000000000000000000000 |