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 | 5 |
| 2 | 27 |
| 3 | 495 |
| 4 | 8127 |
| 5 | 33550335 |
| 6 | 8589869055 |
| 7 | 137438691327 |
| 8 | 2305843008139952127 |
| 9 | 2658455991569831744654692615953842175 |
| 10 | 191561942608236107294793378084303638130997321548169215 |