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 | 15 |
| 2 | -167 |
| 3 | -14265 |
| 4 | -17583 |
| 5 | 22103775 |
| 6 | 366019305 |
| 7 | -46497789225 |
| 8 | -1701823811295 |
| 9 | 120289709840175 |
| 10 | 7808380053851385 |
| 11 | -354409961765715225 |
| 12 | -38985884218692900495 |
| 13 | 1082356196865530910975 |
| 14 | 214907408931441984587145 |
| 15 | -2716359674426403870623625 |