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 | 6 |
| 2 | 22 |
| 3 | 490 |
| 4 | 8100 |
| 5 | 33550330 |
| 6 | 8589868538 |
| 7 | 137438691322 |
| 8 | 2305843008139944000 |
| 9 | 2658455991569831744654692615953841680 |
| 10 | 191561942608236107294793378084303638130997321514618858 |