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 | 28 |
| 2 | 908 |
| 3 | 37896 |
| 4 | 2036592 |
| 5 | 138517632 |
| 6 | 11692594944 |
| 7 | 1202885199360 |
| 8 | 148407122764800 |
| 9 | 21652192199577600 |
| 10 | 3690199478509977600 |
| 11 | 726862474705593139200 |
| 12 | 163918208008013340672000 |