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 | 41 |
| 3 | 257 |
| 4 | 1553 |
| 5 | 15672832817 |
| 6 | 121871948002097 |
| 7 | 4387390128075569 |
| 8 | 161656255492952812128627920091307258673 |
| 9 | 34917751186477807419783630739722367873841 |