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 | -28 |
| 2 | 322 |
| 3 | -1792 |
| 4 | 3059 |
| 5 | 18788 |
| 6 | -109970 |
| 7 | 96232 |
| 8 | 739669 |
| 9 | -1676136 |
| 10 | -2594074 |
| 11 | 6667864 |
| 12 | 22486226 |
| 13 | -26768980 |
| 14 | -188468912 |
| 15 | 174822312 |
| 16 | 845108712 |
| 17 | -60897844 |
| 18 | -3216451658 |
| 19 | -5497042096 |
| 20 | 11876402839 |
| 21 | 31175102772 |