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) |
|---|---|
| 2 | 1 |
| 3 | -97 |
| 4 | 52558 |
| 5 | -5240581 |
| 6 | 4720558732 |
| 7 | -7481314964114 |
| 8 | 1271274660247796 |
| 9 | -9765829515601025979 |
| 10 | 161400398363673797534104 |
| 11 | -292099194247292179451930316 |
| 12 | 2969226837548487086516550438360 |