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) |
|---|---|
| 3 | 25 |
| 4 | 1009 |
| 5 | 7983361 |
| 6 | 1245404161 |
| 7 | 71137485619201 |
| 8 | 24329020081766401 |
| 9 | 5170403347776995328001 |
| 10 | 1768352398747940390908723200001 |
| 11 | 1644567730835584563545112576000001 |