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 | 3 |
| 2 | 11 |
| 3 | 43 |
| 4 | 2731 |
| 5 | 43691 |
| 6 | 174763 |
| 7 | 715827883 |
| 8 | 768614336404564651 |
| 9 | 56713727820156410577229101238628035243 |