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 | 11 |
| 3 | -137 |
| 4 | 121 |
| 5 | -7129 |
| 6 | 57844301 |
| 7 | -1145993 |
| 8 | 4325053069 |
| 9 | -1848652896341 |
| 10 | 48069674759189 |
| 11 | -1464950131199 |
| 12 | 105020512675255609 |
| 13 | -22404210159235777 |
| 14 | 1060366791013567384441 |
| 15 | -15899753637685210768473787 |
| 16 | 2241672100026760127622163469 |
| 17 | -8138835628210212414423299 |