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 | 2 |
| 2 | 155 |
| 3 | 9692 |
| 4 | 2511973 |
| 5 | 718800326 |
| 6 | 444293699995 |
| 7 | 322762198901872 |
| 8 | 375936459278442977 |
| 9 | 517934214393739253282 |
| 10 | 977731835276897269439162 |
| 11 | 2156693302479983573313980822 |
| 12 | 5955566258836615476254796252771 |
| 13 | 18881697488276229387856391071794848 |