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 | 3 |
| 2 | 99 |
| 3 | 43881 |
| 4 | 280974025 |
| 5 | 26916213134875 |
| 6 | 39339805703866118875 |
| 7 | 887919033897631593738548625 |
| 8 | 311967217568836709207331125906048625 |
| 9 | 1715750319988362944273302140220635494624999475 |