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 | 7 |
| 3 | 13 |
| 4 | 31 |
| 5 | 97 |
| 6 | 127 |
| 7 | 223 |
| 8 | 1567 |
| 9 | 3583 |
| 10 | 4801 |
| 11 | 6271 |
| 12 | 8191 |
| 13 | 19207 |
| 14 | 25087 |
| 15 | 33613 |
| 16 | 76831 |
| 17 | 131071 |
| 18 | 401407 |
| 19 | 524287 |
| 20 | 917503 |
| 21 | 1229311 |
| 22 | 1605631 |
| 23 | 3764767 |
| 24 | 6588343 |
| 25 | 14680063 |
| 26 | 184473631 |
| 27 | 737894527 |
| 28 | 2147483647 |
| 29 | 2259801991 |
| 30 | 2877292543 |
| 31 | 3758096383 |