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 | 124 |
| 4 | 25390 |
| 5 | 5990844 |
| 6 | 2288640858 |
| 7 | 813680351264 |
| 8 | 195620550257778 |