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 | 2 |
| 1 | 2 |
| 2 | 2 |
| 3 | 2 |
| 4 | 2 |
| 5 | 54 |
| 6 | 162 |
| 7 | 8310407949893763072 |
| 8 | 46438023168 |
| 9 | 65229815808 |
| 10 | 396718580736 |
| 11 | 629856 |
| 12 | 152461794335880672662217818112 |