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 | 4 |
| 4 | 18 |
| 5 | 48 |
| 6 | 216 |
| 7 | 584 |
| 8 | 2870 |
| 9 | 10408 |
| 10 | 45244 |
| 11 | 160248 |
| 12 | 762554 |