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 | 1 |
| 3 | 3 |
| 4 | 9 |
| 5 | 135 |
| 6 | 6075 |
| 7 | 1913625 |
| 8 | 602791875 |
| 9 | 1708914965625 |
| 10 | 24223869637734375 |
| 11 | 3777106873263732421875 |
| 12 | 1766836167640942433642578125 |
| 13 | 10744263248137144009663040771484375 |
| 14 | 457356694421659081059931729616180419921875 |