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 | 40 |
| 5 | 488 |
| 6 | 13782 |
| 7 | 757626 |
| 8 | 95835196 |
| 9 | 24236840344 |
| 10 | 13996574799274 |