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 | -11 |
| 4 | -7 |
| 5 | 41 |
| 6 | 117 |
| 7 | 29 |
| 8 | -527 |
| 9 | -1199 |
| 10 | 237 |
| 11 | 6469 |
| 12 | 11753 |
| 13 | -8839 |
| 14 | -76443 |
| 15 | -108691 |
| 16 | 164833 |
| 17 | 873121 |
| 18 | 922077 |
| 19 | -2521451 |
| 20 | -9653287 |
| 21 | -6699319 |
| 22 | 34867797 |
| 23 | 103232189 |
| 24 | 32125393 |
| 25 | -451910159 |
| 26 | -1064447283 |
| 27 | 130656229 |
| 28 | 5583548873 |