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 | 9 |
| 2 | 405 |
| 3 | 121500 |
| 4 | 247203171 |
| 5 | 3543210805275 |
| 6 | 373203783345533355 |
| 7 | 299059356226224581923626 |
| 8 | 1870707073035678423776605220985 |
| 9 | 93075349691648156957700437094276630105 |