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) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 72 |
| 4 | 1824 |
| 5 | 220608 |
| 6 | 498243968 |
| 7 | 309072306743552 |
| 8 | 14369391925598802012151296 |
| 9 | 146629927766168786239127150948525247729660416 |