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 | 30 |
| 4 | 444 |
| 5 | 1767 |
| 6 | 86250 |
| 7 | 97920 |
| 8 | 185700 |
| 9 | 584640 |
| 10 | 21954842 |
| 11 | 17654544432 |
| 12 | 357550809280 |
| 13 | 709346653572 |
| 14 | 1061551370880 |