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 | 21 |
| 2 | 2133 |
| 3 | 19521 |
| 4 | 176661 |
| 5 | 129127041 |
| 6 | 328256967373616371221 |