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 | 2 |
| 1 | 17 |
| 2 | 257 |
| 3 | 241 |
| 4 | 65537 |
| 5 | 61681 |
| 6 | 673 |
| 7 | 15790321 |
| 8 | 6700417 |
| 9 | 38737 |
| 10 | 4278255361 |
| 11 | 2931542417 |
| 12 | 22253377 |
| 13 | 308761441 |
| 14 | 54410972897 |
| 15 | 4562284561 |
| 16 | 67280421310721 |
| 17 | 2879347902817 |
| 18 | 487824887233 |
| 19 | 24517014940753 |
| 20 | 44479210368001 |
| 21 | 88959882481 |