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 | 4 |
| 3 | 39 |
| 4 | 723 |
| 5 | 21965 |
| 6 | 968230 |
| 7 | 57967660 |
| 8 | 4505774905 |
| 9 | 439923593145 |
| 10 | 52601045792520 |