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) |
|---|---|
| 1 | 1 |
| 2 | 18 |
| 3 | 1566 |
| 4 | 354456 |
| 5 | 163932120 |
| 6 | 134973740880 |
| 7 | 180430456454640 |
| 8 | 366311352681348480 |