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 | 3 |
| 2 | 2 |
| 3 | 4 |
| 4 | 11 |
| 5 | 18 |
| 6 | 75 |
| 7 | 621 |
| 8 | 9638 |
| 9 | 1264052 |
| 10 | 1294752365 |
| 11 | 20699153586797 |
| 12 | 43409394810283725529 |