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 | 1 |
| 2 | 1 |
| 3 | 4 |
| 4 | 29 |
| 5 | 293 |
| 6 | 2566 |
| 7 | 24844 |
| 8 | 259437 |
| 9 | 2908263 |
| 10 | 35102629 |
| 11 | 455204360 |
| 12 | 6321171774 |