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 | -26 |
| 2 | 325 |
| 3 | -2626 |
| 4 | 15626 |
| 5 | -74256 |
| 6 | 298831 |
| 7 | -1063426 |
| 8 | 3447132 |
| 9 | -10372882 |
| 10 | 29340142 |
| 11 | -78744042 |
| 12 | 202029633 |
| 13 | -498419898 |
| 14 | 1187802148 |
| 15 | -2744629914 |
| 16 | 6168519890 |
| 17 | -13520237380 |
| 18 | 28964225680 |
| 19 | -60763817556 |
| 20 | 125042511217 |
| 21 | -252773944748 |
| 22 | 502601225828 |
| 23 | -984061449124 |
| 24 | 1899179853506 |