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 | 1 |
| 3 | 2 |
| 4 | 7 |
| 5 | 27 |
| 6 | 138 |
| 7 | 822 |
| 8 | 5154 |
| 9 | 33880 |
| 10 | 227495 |
| 11 | 1554266 |
| 12 | 10749089 |
| 13 | 75106906 |