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 | 1 |
| 2 | -3 |
| 3 | 8 |
| 4 | -21 |
| 5 | -12167 |
| 6 | -1708047 |
| 7 | -116428560 |
| 8 | -33081320935 |
| 9 | -1098860747703 |
| 10 | -579469550006151 |