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 | 2 |
| 2 | 12 |
| 3 | 720 |
| 4 | 3628800 |
| 5 | 144850083840000 |
| 6 | 272760108249915378892800000000 |
| 7 | 1264767303092594444142256488682840323816161280000000000000000 |