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) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 3528 |
| 3 | 115379712 |
| 4 | 241909719367680 |
| 5 | 32467582052437076213760 |
| 6 | 278893342293098904613804037898240 |
| 7 | 153323163270070838469523866093442017326530560 |