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 | 2 |
| 2 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 720 |
| 6 | 362880 |
| 7 | 6402373705728000 |
| 8 | 265252859812191058636308480000000 |
| 9 | 710998587804863451854045647463724949736497978881168458687447040000000000000 |