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 | 74 |
| 4 | 23640 |
| 5 | 8632118 |
| 6 | 6204309386 |
| 7 | 11105331450864 |
| 8 | 55821544343692020 |
| 9 | 843729327193891754770 |
| 10 | 40033544602806238643588014 |