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 | 17 |
| 2 | 21800053277 |
| 3 | 86984485062381462583582279727 |
| 4 | 2948338207972508983453357158259221375675126583677039825367935271466652794027 |