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 | 5 |
| 3 | 17 |
| 4 | 613 |
| 5 | 129266611 |
| 6 | 7625731683761 |
| 7 | 150094704016430497 |
| 8 | 2503155504994422192936289397051173 |
| 9 | 4638397686588101984398752568803509060305779468709 |