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 | 1 |
| 2 | 2 |
| 3 | 12 |
| 4 | 408 |
| 5 | 470832 |
| 6 | 627013566048 |
| 7 | 1111984844349868137938112 |
| 8 | 3497379255757941172020851852070562919437964212608 |