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) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | -1 |
| 3 | 8 |
| 4 | 28 |
| 5 | 282 |
| 6 | 27495 |
| 7 | 581268 |
| 8 | 17344692 |
| 9 | 1246207300 |
| 10 | 33366771123 |