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 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 13 |
| 4 | 47 |
| 5 | 307 |
| 6 | 2163 |
| 7 | 17557 |
| 8 | 191807 |
| 9 | 1413443 |
| 10 | 16485763 |
| 11 | 169053487 |