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 | 4 |
| 1 | 3 |
| 2 | 5 |
| 3 | 21 |
| 4 | 17 |
| 5 | 341 |
| 6 | 13 |
| 7 | 5461 |
| 8 | 257 |
| 9 | 4161 |
| 10 | 205 |
| 11 | 1398101 |
| 12 | 241 |
| 13 | 22369621 |
| 14 | 3277 |
| 15 | 49981 |
| 16 | 65537 |
| 17 | 5726623061 |
| 18 | 4033 |
| 19 | 91625968981 |
| 20 | 61681 |
| 21 | 12783421 |
| 22 | 838861 |
| 23 | 23456248059221 |
| 24 | 65281 |
| 25 | 1100586419201 |
| 26 | 13421773 |
| 27 | 68719738881 |