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) |
|---|---|
| 1 | 1 |
| 2 | -2 |
| 3 | -11 |
| 4 | -33 |
| 5 | -52174 |
| 6 | 260515 |
| 7 | -573204 |
| 8 | 37362253 |
| 9 | -42781604 |
| 10 | 122925461 |
| 11 | 534483448 |
| 12 | 3083975227 |
| 13 | 902209779836 |
| 14 | -2685575996367 |
| 15 | -65398140378926 |
| 16 | 74357078147863 |
| 17 | 214112296674652 |
| 18 | 642336890023956 |
| 19 | -5920787228742393 |
| 20 | -12055686754159438 |
| 21 | 18190586279576483 |
| 22 | -48436859313312404 |