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 | 22 |
| 2 | 864 |
| 3 | 40512 |
| 4 | 2075860 |
| 5 | 112225776 |
| 6 | 6289396632 |
| 7 | 361699896960 |
| 8 | 21210328632420 |
| 9 | 1262859239910000 |
| 10 | 76114899842912520 |