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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 203 |
| 4 | 5765385 |
| 5 | 662305416760 |
| 6 | 202380163158922023 |
| 7 | 141390361908351519807928 |