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 | 399736269009 |
| 2 | 1013616036225 |
| 3 | 1393148751631700625 |
| 4 | 2998748839068013955625 |
| 5 | 3547850289210724050225 |