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 | 3 |
| 2 | 23 |
| 3 | 487 |
| 4 | 8115 |
| 5 | 33550311 |
| 6 | 8589869023 |
| 7 | 137438691291 |
| 8 | 2305843008139952067 |
| 9 | 2658455991569831744654692615953842055 |
| 10 | 191561942608236107294793378084303638130997321548169039 |