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 | 8 |
| 4 | 68 |
| 5 | 1270 |
| 6 | 53200 |
| 7 | 5068960 |
| 8 | 1109820882 |
| 9 | 562711290616 |
| 10 | 664773220895406 |