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 | 3 |
| 3 | 20 |
| 4 | 305 |
| 5 | 10150 |
| 6 | 746346 |
| 7 | 121621207 |
| 8 | 43857418181 |
| 9 | 34948902833111 |
| 10 | 61568080277621258 |
| 11 | 239709187163404332821 |