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 | 4 |
| 2 | 67 |
| 3 | 354559 |
| 4 | 55140694943446374 |
| 5 | 207861305741947432194260517035962625798813317184891 |