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 | 2 |
| 3 | 10 |
| 4 | 276 |
| 5 | 81901 |
| 6 | 2247615258 |
| 7 | 81658169024988865 |
| 8 | 644986443956439734064225751112 |
| 9 | 3427833941153173630835645403655873661712817810325122 |