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 | 5 |
| 2 | 131 |
| 3 | 54869 |
| 4 | 863585783 |
| 5 | 174960197237646244878763893842845824429634127969 |