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 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 685 |
| 7 | 4148 |
| 8 | 25661 |
| 9 | 159829 |
| 10 | 997870 |
| 11 | 6240672 |
| 12 | 39111747 |
| 13 | 245782289 |
| 14 | 1549368610 |