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 | -19 |
| 3 | 89 |
| 4 | -46261 |
| 5 | 23323 |
| 6 | -114895757 |
| 7 | 760567603 |
| 8 | -174446569403 |
| 9 | 302339104957 |
| 10 | -2125170096355349 |
| 11 | 3788248001789087 |
| 12 | -1573899862241140688567 |
| 13 | 317684785943639774839 |
| 14 | -2242333884754953400123 |