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 | 7 |
| 2 | 13 |
| 3 | 29 |
| 4 | 97 |
| 5 | 113 |
| 6 | 193 |
| 7 | 449 |
| 8 | 509 |
| 9 | 769 |
| 10 | 7937 |
| 11 | 12289 |
| 12 | 114689 |
| 13 | 520193 |
| 14 | 786433 |
| 15 | 7340033 |
| 16 | 8388593 |
| 17 | 33292289 |
| 18 | 33550337 |
| 19 | 469762049 |
| 20 | 2130706433 |
| 21 | 3221225473 |
| 22 | 8588886017 |
| 23 | 137438691329 |
| 24 | 206158430209 |
| 25 | 2199023254529 |
| 26 | 6597069766657 |
| 27 | 562948879679489 |
| 28 | 7881299347898369 |
| 29 | 9007182074871809 |