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 | 1 |
| 2 | 11 |
| 3 | 341 |
| 4 | 581337017 |
| 5 | 7202608727 |
| 6 | 27146455379 |
| 7 | 1358496201131 |
| 8 | 9843739213499 |
| 9 | 172392038905691 |