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 | 9 |
| 3 | 471 |
| 4 | 82899 |
| 5 | 36913581 |
| 6 | 34878248649 |
| 7 | 62045165964951 |
| 8 | 190543753640526939 |
| 9 | 945931782247964900901 |
| 10 | 7209377339218632463758129 |
| 11 | 80920117567254715984058542191 |
| 12 | 1292645840976784584918218615760819 |
| 13 | 28557854803885245556927129118200208781 |