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) |
|---|---|
| 2 | 0 |
| 3 | 60 |
| 4 | 8472 |
| 5 | 504864 |
| 6 | 105970762 |
| 7 | 3866050034 |
| 8 | 52280148964 |
| 9 | 409561925588 |
| 10 | 2277489900016 |