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 | 2 |
| 3 | 7 |
| 4 | 36 |
| 5 | 239 |
| 6 | 1892 |
| 7 | 17015 |
| 8 | 168503 |
| 9 | 1799272 |
| 10 | 20409644 |