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) |
|---|---|
| 2 | 1 |
| 3 | 92 |
| 4 | 11280 |
| 5 | 1104960 |
| 6 | 254787279 |
| 7 | 24163544599 |
| 8 | 600100462863 |
| 9 | 7188707496364 |