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 | 19 |
| 2 | -89 |
| 3 | -18791 |
| 4 | -236879 |
| 5 | 29323099 |
| 6 | 1090116631 |
| 7 | -58460151311 |
| 8 | -4544610262559 |
| 9 | 124108949730979 |
| 10 | 20763741608252551 |
| 11 | -163979183232607031 |
| 12 | -105896125442269661039 |
| 13 | -1126538793947045592341 |
| 14 | 598088096752283650823671 |
| 15 | 18460868240159776597398049 |