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) |
|---|---|
| 3 | 0 |
| 4 | 70 |
| 5 | 4322 |
| 6 | 5922628 |
| 7 | 263152508 |
| 8 | 2962900186 |
| 9 | 18395486320 |
| 10 | 81624918686 |