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 | 30 |
| 2 | 22500 |
| 3 | 421875000 |
| 4 | 197753906250000 |
| 5 | 2317428588867187500000 |
| 6 | 678934156894683837890625000000 |
| 7 | 4972662281943485140800476074218750000000 |