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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 24 |
| 6 | 576 |
| 7 | 165888 |
| 8 | 9172942848 |
| 9 | 21035720123168587776 |
| 10 | 18437563379178327736384102280592359424 |
| 11 | 590180110002114158896983994712576414865667267958188575935810179040280576 |