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 | -24 |
| 3 | 260 |
| 4 | -1670 |
| 5 | 6999 |
| 6 | -19698 |
| 7 | 36408 |
| 8 | -40240 |
| 9 | 20170 |