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 | 125000 |
| 2 | 61298400 |
| 3 | 578869250 |
| 4 | 4511718750 |
| 5 | 195312500000 |
| 6 | 2918554687500 |
| 7 | 3874552343750 |