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 | 0 |
| 2 | 1 |
| 3 | 8 |
| 4 | 66 |
| 5 | 722 |
| 6 | 9955 |
| 7 | 165252 |
| 8 | 3221806 |
| 9 | 72445292 |
| 10 | 1851203574 |
| 11 | 53113148720 |
| 12 | 1694163830194 |
| 13 | 59579694687012 |