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 | 4 |
| 2 | 72 |
| 3 | 2896 |
| 4 | 203904 |
| 5 | 22112000 |
| 6 | 3412366336 |
| 7 | 709998153728 |
| 8 | 191483931951104 |
| 9 | 64956739430973440 |
| 10 | 27065724289967718400 |
| 11 | 13588059904833174896640 |
| 12 | 8089418253144660155301888 |
| 13 | 5634743143901240164716904448 |
| 14 | 4539998748622480932947483426816 |