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 | 2 |
| 3 | 3 |
| 4 | -12 |
| 5 | -10 |
| 6 | -6 |
| 7 | -49 |
| 8 | -48 |
| 9 | -90 |
| 10 | -120 |
| 11 | 1320 |
| 12 | 1080 |
| 13 | 624 |
| 14 | 9604 |
| 15 | 9360 |
| 16 | 17280 |
| 17 | 22440 |
| 18 | -403920 |
| 19 | -328320 |
| 20 | -187200 |
| 21 | -4235364 |
| 22 | -4118400 |
| 23 | -7551360 |
| 24 | -9694080 |
| 25 | 242352000 |
| 26 | 196335360 |
| 27 | 111196800 |
| 28 | 3320525376 |
| 29 | 3224707200 |
| 30 | 5890060800 |
| 31 | 7512912000 |
| 32 | -240413184000 |
| 33 | -194372006400 |
| 34 | -109640044800 |