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) |
|---|---|
| 2 | 1 |
| 3 | 177 |
| 4 | 15253 |
| 5 | 944157 |
| 6 | 48602431 |
| 7 | 2230830597 |
| 8 | 94819936513 |
| 9 | 3816886269599 |