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 | 1024 |
| 3 | 1560 |
| 4 | 44903401 |
| 5 | 4684821704 |
| 6 | 4919350997521 |
| 7 | 1286684357154700 |
| 8 | 711683286892712289 |
| 9 | 249788326721013262468 |
| 10 | 113635514869793774013025 |
| 11 | 44202928096066452637659216 |