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 | -1 |
| 3 | -19 |
| 4 | 11 |
| 5 | -19 |
| 6 | 27 |
| 7 | -11 |
| 8 | 11 |
| 9 | -27 |
| 10 | -863 |
| 11 | 271 |
| 12 | -191 |
| 13 | 271 |
| 14 | -863 |
| 15 | 1375 |
| 16 | -351 |
| 17 | 191 |
| 18 | -191 |
| 19 | 351 |
| 20 | -1375 |
| 21 | -33953 |
| 22 | 7297 |
| 23 | -3233 |
| 24 | 2497 |
| 25 | -3233 |
| 26 | 7297 |
| 27 | -33953 |