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 | 3 |
| 4 | 10 |
| 5 | 44 |
| 6 | 249 |
| 7 | 1513 |
| 8 | 9992 |
| 9 | 68305 |
| 10 | 480748 |
| 11 | 3450793 |
| 12 | 25186583 |