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 | -12 |
| 2 | 66 |
| 3 | -232 |
| 4 | 639 |
| 5 | -1596 |
| 6 | 3774 |
| 7 | -8328 |
| 8 | 17283 |
| 9 | -34520 |
| 10 | 66882 |
| 11 | -125568 |
| 12 | 229244 |
| 13 | -409236 |
| 14 | 716412 |
| 15 | -1231048 |
| 16 | 2079237 |
| 17 | -3459264 |
| 18 | 5677832 |
| 19 | -9200232 |
| 20 | 14729592 |
| 21 | -23325752 |
| 22 | 36567222 |
| 23 | -56778888 |
| 24 | 87369483 |
| 25 | -133315692 |