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 | 125 |
| 3 | 4007754 |
| 4 | 132460031222098852477 |
| 5 | 4782311037918647241715144272946478084784910628903006412891408 |