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 | 16 |
| 3 | 714 |
| 4 | 62528 |
| 5 | 9056720 |
| 6 | 1960138560 |
| 7 | 592615689904 |
| 8 | 238560786221056 |
| 9 | 123358665203311104 |
| 10 | 79683847063011614720 |