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 | 5 |
| 2 | -6 |
| 3 | 41 |
| 4 | -85 |
| 5 | -2069 |
| 6 | 8605 |
| 7 | 3990 |
| 8 | 36685 |
| 9 | -254525 |
| 10 | -3603805 |
| 11 | 13479425 |
| 12 | 23579969 |
| 13 | 237487433 |
| 14 | -1795846200 |
| 15 | -6788705842 |
| 16 | 44427298525 |
| 17 | -48251561329 |
| 18 | 1187033450882 |
| 19 | -5419042629125 |
| 20 | -29806300419830 |
| 21 | 195349574327650 |
| 22 | -288613313574270 |
| 23 | 2714096998599960 |
| 24 | -8002401055092375 |