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 | 1 |
| 2 | 1 |
| 3 | 9 |
| 4 | 165 |
| 5 | 4629 |
| 6 | 175689 |
| 7 | 8424801 |
| 8 | 488756205 |
| 9 | 33292495341 |
| 10 | 2605108910481 |
| 11 | 230300167685049 |
| 12 | 22701604019859765 |
| 13 | 2468971586334241989 |
| 14 | 293687751861227612889 |
| 15 | 37930838135497768301841 |
| 16 | 5286141242516127169100925 |
| 17 | 790686768925097978507354781 |
| 18 | 126349187477795223746580576801 |