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 | 16 |
| 2 | 76544 |
| 3 | 2941306368 |
| 4 | 331333877743200 |
| 5 | 88366736882654697600 |
| 6 | 48653237600359922073441120 |
| 7 | 49992325433734834899948931370880 |