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) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 2 |
| 3 | 3 |
| 4 | 5 |
| 5 | 17 |
| 6 | 161 |
| 7 | 15681 |
| 8 | 159591041 |
| 9 | 16866847940875521 |
| 10 | 189345699699803478502456213711361 |