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 | 1 |
| 2 | 145 |
| 3 | 3008593 |
| 4 | 8984079652177 |
| 5 | 3863006623296221245777 |
| 6 | 239187274872617784539568647160145 |
| 7 | 2132617833186094044575170253829071294297506129 |