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 | 1 |
| 2 | -49 |
| 3 | 41 |
| 4 | 26291 |
| 5 | -1921 |
| 6 | 845233 |
| 7 | 1048349 |
| 8 | -60517579 |
| 9 | -50233 |
| 10 | 506605371959 |
| 11 | 823605863 |
| 12 | -53797712101337483 |
| 13 | -7784082036337 |
| 14 | 8049010408144441 |
| 15 | 246319059461 |
| 16 | -3910018782537447618421 |
| 17 | 1090400590625849 |