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 | 1 |
| 2 | -15 |
| 3 | 105 |
| 4 | -455 |
| 5 | 1353 |
| 6 | -2861 |
| 7 | 4275 |
| 8 | -4305 |
| 9 | 2606 |
| 10 | -704 |
| 11 | 0 |