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) |
|---|---|
| 3 | 1 |
| 4 | -1595 |
| 5 | 2775445 |
| 6 | -4793193515 |
| 7 | 8283038077141 |
| 8 | -14313032243145515 |
| 9 | 24732928003956401365 |
| 10 | -42738498397393357626155 |
| 11 | 73852125402551558141191381 |
| 12 | -127616472670861852065241422635 |