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 | 0 |
| 2 | 0 |
| 3 | 456 |
| 4 | 23592 |
| 5 | 10213152 |
| 6 | 871718016 |
| 7 | 131259920304 |
| 8 | 22870582657920 |
| 9 | 3420936792374976 |