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 | 6 |
| 3 | 1462 |
| 4 | 1584088 |
| 5 | 8616332520 |
| 6 | 71643177829872 |
| 7 | 1642669067898696816 |