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 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 32 |
| 4 | 802 |
| 5 | 36854 |
| 6 | 2698598 |
| 7 | 288450168 |
| 8 | 42388536888 |
| 9 | 8198703649296 |
| 10 | 2019226648157472 |
| 11 | 616991110153816848 |
| 12 | 229048514514263311008 |
| 13 | 101540936651344709359632 |
| 14 | 52984383824921037875927760 |
| 15 | 32145394332240602286960456192 |