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 | 0 |
| 1 | 75 |
| 2 | 5700 |
| 3 | 32490075 |
| 4 | 1055604973505700 |
| 5 | 1114301860089969598947932490075 |
| 6 | 1241668635399966182910364962424859894024949485439789973505700 |