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) |
|---|---|
| 3 | 1 |
| 4 | 3 |
| 5 | 46 |
| 6 | 6552 |
| 7 | 11270400 |
| 8 | 335390189568 |
| 9 | 224382967916691456 |
| 10 | 4292039421591854273003520 |
| 11 | 2905990310033882693113989027594240 |