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 | 1 |
| 3 | 5 |
| 4 | 74 |
| 5 | 2668 |
| 6 | 150836 |
| 7 | 12011058 |
| 8 | 1279437414 |
| 9 | 175836809388 |
| 10 | 30308775142980 |
| 11 | 6404886614932128 |