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 | 1 |
| 2 | 7 |
| 3 | 647 |
| 4 | 878769 |
| 5 | 18203480001 |
| 6 | 5850859031888599 |
| 7 | 29453515169174062608487 |
| 8 | 2335404534493957255219087217249 |
| 9 | 2927451248337363113001580852250754885313 |