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 | 2 |
| 3 | 8 |
| 4 | 48 |
| 5 | 5760 |
| 6 | 36495360 |
| 7 | 1854081073152000 |
| 8 | 400440702414394285778534400000 |
| 9 | 165062110921422523175104166476600499887194872217600000000 |