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 | 0 |
| 2 | 4 |
| 3 | 32 |
| 4 | 512 |
| 5 | 15872 |
| 6 | 907008 |
| 7 | 104535552 |
| 8 | 22523623424 |
| 9 | 9599255461888 |
| 10 | 7747175087620096 |