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) |
|---|---|
| 1 | 2 |
| 2 | -6 |
| 3 | 34 |
| 4 | 1154 |
| 5 | 1331714 |
| 6 | 1773462177794 |
| 7 | 3145168096065837266706434 |
| 8 | 9892082352510403757550172975146702122837936996354 |