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 | 2 |
| 3 | 33 |
| 4 | 129 |
| 5 | 1081 |
| 6 | 2049 |
| 7 | 9233 |
| 8 | 33793 |
| 9 | 458753 |
| 10 | 2015233 |
| 11 | 3932161 |
| 12 | 33554945 |
| 13 | 188743681 |