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) |
|---|---|
| 4 | 1 |
| 5 | 26 |
| 6 | 1768 |
| 7 | 225096 |
| 8 | 51725352 |
| 9 | 21132802554 |
| 10 | 15463799747936 |
| 11 | 20604021770403328 |
| 12 | 50928019401158515328 |
| 13 | 237644423948928994197504 |
| 14 | 2125373296900166452199861760 |