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 | 0 |
| 2 | 3 |
| 3 | 2 |
| 4 | 27 |
| 5 | 90 |
| 6 | 7003 |
| 7 | 744282 |
| 8 | 14687099739 |
| 9 | 12786682083105626 |
| 10 | 529158535306496354546309979 |
| 11 | 7914572860144723898900437268660641289952090 |