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 | 3 |
| 2 | 5 |
| 3 | -9 |
| 4 | -119 |
| 5 | -597 |
| 6 | -2035 |
| 7 | -4449 |
| 8 | -239 |
| 9 | 56403 |
| 10 | 341525 |
| 11 | 1315911 |
| 12 | 3455641 |
| 13 | 3627003 |
| 14 | -23161315 |
| 15 | -186118929 |
| 16 | -815616479 |
| 17 | -2474152797 |
| 18 | -4241902555 |
| 19 | 6712571031 |
| 20 | 95420159401 |
| 21 | 485257533003 |
| 22 | 1671083125805 |
| 23 | 3718150825791 |
| 24 | 584824319281 |