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 | 4 |
| 3 | 756 |
| 4 | 1729728 |
| 5 | 140229804000 |
| 6 | 752239365180732000 |
| 7 | 419014989521191873479589920 |
| 8 | 34623595988556658225393154134784716800 |
| 9 | 571228532851873223553288547443139274046846826752000 |